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Skeletal system - class-V

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The supportive structure of our pinna is also found in _______________.

  1. Tip of nose

  2. Ear ossicles

  3. Vertebrae

  4. Nails


Correct Option: A
Explanation:

  • The kind of tissue that forms the supportive structure in our pinna (external ears) is also found in tip of the nose. 
  • As External pinna is made up of elastic cartilage. 
  • It is passage towards middle ear. Hence, The supportive structure of our pinna is also found in the tip of the nose.
So, the correct answer is 'tip of nose'.

Number of bones of face is

  1. 12

  2. 30

  3. 40

  4. 14


Correct Option: D
Explanation:
The number of bones in face is 14. They are as inferior nasal concha (2), Lacrimal bones (2), Mandible (1), Maxilla (2), Nasal bones (2), Palatine bones (2), Vomer (1), Zygomatic bones (2).
So, the correct answer is '14'.

A joint made for power is

  1. Knee joint

  2. Suture in cranium

  3. Joint between vertebrae

  4. Mandibular joint


Correct Option: D
Explanation:
  • The lower jaw is made up of a single bone called mandible.
  • The mandible is the longest and strongest bone in the face. It forms the lower jaw and holds the teeth in place.
  •  Movement of the lower jaw opens and closes the mouth and also allows for the chewing of food. The lower set of teeth in the mouth is rooted in the lower jaw.
  • The mandibular joint is a joint made for power. It connects the lower jaw bone to the skull.
  • So, the correct answer is 'Mandibular joint'.

The characteristics and an example of a synovial joint in humans is :

  1. Characteristics - Fluid cartilage between two bones, limited movements, Examples - Knee joint

  2. Characteristics - Fluid filled between two joints, provides cushion, Examples - Skull bones

  3. Characteristics - Fluid filled synovial cavity between two bones, Examples - Joint between atlas and axis

  4. Characteristics - Lymph filled between two bones, limited movement, Examples - Gliding joint between carpals


Correct Option: C
Explanation:
All articulations between bones that help in a certain kind of movement, are placed at a distance from each other to prevent friction between them during movement. This space between the two bones is filled with synovial fluid that also helps reduce friction. For example the ball and socket joint of the pelvic girdle, the pivotal joint between the atlas and the axis
So, the correct answer is 'Characteristics - Fluid filled synovial cavity between two bones, Examples - Joint between atlas and axis'

Which one of the following secretes a watery fluid for lubricating and cushioning the joint?

  1. Ligament

  2. Cartilage

  3. Tendon

  4. Synovial membrane


Correct Option: D
Explanation:
  • Joints are points of contact between bones, or between bones and cartilages.
  • Synovial joints are characterized by the presence of a fluid-filled synovial cavity between the articulating surfaces of the two bones. These joints help in locomotion and many other movements.
  • The synovial cavity is covered by the synovial membrane which secretes a watery fluid called synovial fluid for the lubricating and cushioning joint.
  • So, the correct answer is 'Synovial membrane'.

Synovial joints may be classified into subtypes according to

  1. Shape

  2. Amount of synovial fluid

  3. Number of bones

  4. Amount of cartilage


Correct Option: A
Explanation:

Based on the movement ability, fibrous and cartilaginous joints are functionally classified as a synarthrosis or amphiarthrosis, the synovial joints are classified on the basis of shape.

So, the correct option is 'Shape'.

Joints between human skull bones are

  1. Saddle

  2. Gliding

  3. Imperfect

  4. Immovable


Correct Option: D
Explanation:
A. Saddle joint allows movement on many directions and is present between carpals and metacarpals of the human thumb.
B. Gliding joint allows movement only in one direction and is present between tarsal and carpals.
C. Imperfect joint or Cartilaginous joint are joined together with the help of a disc of cartilage which restricts the movement and shows limited or slight movement and is present between the adjacent vertebrae of the vertebral column and in pubic symphysis.
D. The immovable joint does not allow any movement because the bones are firmly fixed together by strong collagen fibers and are present in the skull bones called as sutures.
So, the correct option is D.

A shallow depression in the scapula which receives the head of the upper arm bone is known as the?

  1. Acetabulum

  2. Neural arch

  3. Glenoid cavity

  4. Olecranon fossa


Correct Option: C
Explanation:
The glenoid cavity of scapula is a part of the shoulder. It is a shallow, pyriform articular surface, which is located on the lateral angle of the scapula.
So correct answer is option C.Glenoid cavity.

Synovial fluid is secreted by

  1. Blood

  2. Cartilage

  3. Bone

  4. Synovial membrane


Correct Option: D
Explanation:

Membranes are thin pliable layers of epithelial and/or connective tissue. They line body cavities, cover surfaces, connect, or separate regions, structures and organs of the body. 

The three kinds of membranes are mucous, serous and synovial. 
Synovial membrane, unlike to other membranes does not contain epithelium. Therefore, it is not the epithelial membrane. It lines the cavities of the freely movable joints. Like serous membrane, it lines structures, that do not open to the exterior. Synovial membranes secrete the synovial fluid that lubricates articular cartilage at the ends of bones as they move at joints.

Sacroiliac joint is

  1. Movable

  2. Immovable

  3. Imperfect

  4. None of the above


Correct Option: B
Explanation:
The sacroiliac joint connects the sacrum (triangular bone at the bottom of the spine) with the pelvis (iliac bone, that is part of the hip joint) on each side of the lower spine. It transmits all the forces of the upper body to the pelvis and legs. There is not a lot of motion in the joint and it is very strong and stable.

In humans, the joint between bones of skull is

  1. Fibrous joint

  2. Hinge joint

  3. Synovial joint

  4. None of the above


Correct Option: A
Explanation:

According to functional classification joints may be immovable (synarthrosis), slightly movable (amphiarthrosis) and freely movable (diarthrosis). 

According to structure joints can be classified into, fibrous, cartilaginous and synovial. 
In fibrous joints, fibrous connective tissue unites articulating bones. No joint cavity is present. They are mostly immovable or slightly movable. 
Sutures (literal meaning to stitch), are immovable joint found between skull bones. 
There are four main sutures in the skull- 
(a) Coronal suture: between the frontal and the two parietal bone. 
(b) Sagittal suture: between the two parietal bones. 
(c) Lambdoidal suture: between parietal and occipital bone. 
(d) Squamosal suture: between parietal bone and temporal bone.

Synovial fluid is present in

  1. Spinal canal

  2. Cranial cavity

  3. Freely movable joints

  4. All of the above


Correct Option: C
Explanation:

The movability of the joints varies depending on different factors. Joints have been classified into three major structural forms, namely, fibrous, cartilaginous and synovial. Synovial joints are characterised by the presence of a fluid-filled synovial cavity between the articulating surfaces of the two bones. Such an arrangement allows considerable movement. These joints help in locomotion and many other movements.

Which of the following pairs is correctly matched?

  1. Fibrous joint- Between phalanges

  2. Cartilaginous joint- Skull bones

  3. Gliding joint- Between zygapophyses of the successive vertebrae

  4. Hinge joint- Between vertebrae


Correct Option: C
Explanation:

Gliding joint is a type of synovial joint, which allows movement of bone about three axes. Gliding joint is essentially flat circular surface and permits movement within narrow limits. Examples of gliding joint are between articular surfaces (zygapophyses) of vertebrae, acromioclavicular joint, some carpals and tarsal bones.

Joint between bones of human skull is

  1. Hinge joint

  2. Synovial joint

  3. Cartilaginous joint

  4. Fibrous joint


Correct Option: D
Explanation:

According to the structure, the joints can be classified into- fibrous, cartilaginous and synovial. 

Fibrous connective tissue unites articulating bones without any joint cavity. Fibrous joints are mostly immovable, some slightly movable usually synarthrosis. 
The suture is found only in the skull. It is a fibrous tissue between articulating bones in children but permanently fused in adults. Thus there is some movement in fetuses and young children but immovable in adults.

Friction is lessened in ball and socket joint by

  1. Coelomic fluid

  2. Synovial fluid

  3. Pericardial fluid

  4. Mucin


Correct Option: B
Explanation:

Synovial joints are characterised by the presence of a fluid filled in synovial cavity, between the articulating surfaces of the two bones. Such an arrangement allows considerable movement by reducing friction between bones. These joints help in locomotion and many other movements. Ball and socket joint (between humerus and pectoral girdle), hinge joint (knee joint), pivot joint (between atlas and axis), gliding joint (between the carpals) and saddle joint (between carpal and metacarpal of thumb) are some examples.

Sutural joints are present between

  1. Thumb and metatarsal

  2. Humerus and radio-ulna

  3. Parietals of skull

  4. Glenoid cavity and pectoral girdle


Correct Option: C
Explanation:

Sutures, meaning to stitch, are immovable joint found between skull bones. 

There are four main sutures in the skull-
a) Coronal suture: between the frontal and the two-parietal bones.
b) Sagittal suture: between the two parietal bones.
c) Lambdoidal suture: between parietal and occipital bone.
d) Squamosal suture: between parietal bone and temporal bone.

Strongest cartilage is

  1. Hyaline cartilage

  2. Fibrous cartilage

  3. Elastic cartilage

  4. None of the above


Correct Option: B
Explanation:

Fibrous cartilage is the strongest kind of cartilage, because it has alternating layers of hyaline cartilage matrix and thick layers of dense collagen fibres oriented in the direction of functional stresses. This type of cartilage does not have a perichondrium as it is usually a transitional layer between hyaline cartilage and tendon or ligament. Thus, option B is correct.

Which of the following acts as a shock absorber to cushion the tibia and the femur where they come together?

  1. Cartilage

  2. Ligament

  3. Tendon

  4. Disc


Correct Option: A
Explanation:

Answer is option A i.e. "Cartilage"
Cartilage is a vertebrate skeletal connective tissue. It is an amorphous matrix and contains glycoproteins, basophilic chondroitin and fine collagen fibres.
Between tibia and femur, cartilage helps as shock absorber, it works to help the knee move smoothly. Cartilage helps in bone to bone ligation. Cartilage is a flexible connective tissue found in many parts of the body.

The type of joint between sternum and the ribs in humans is__________________.

  1. Cartilagenous joint

  2. Fibrous joint

  3. Synovial joint

  4. None of the above


Correct Option: A
Explanation:

Answer is option A i.e. "Cartilagenous joint"
The joint between the first rib and the sternum is cartilaginous. It is also called as sternocostal joint. These joints allow a very small amount of movement.
The bones of fibrous joints are joined by fibrous tissue, e.g.  sutures in the skull or the pelvis.  Fibrous joints allow no movement at all.
The bones of synovial joints meet in a joint capsule, e.g. the knee joint where the femur and tibia meet. These joints are the most common and most moveable joints in the human body.

At which parts of our body can we bend?

  1. Knee

  2. Elbow

  3. Neck

  4. All of the above


Correct Option: D
Explanation:
The knee is one of the largest and most complex joints in the body. The knee joins the thigh bone (femur) to the shin bone (tibia). The smaller bone that runs alongside the tibia (fibula) and the kneecap (patella) are the other bones that make the knee joint.
The elbow joint is the synovial hinge joint between the humerus in the upper arm and the radius and ulna in the forearm which allows the hand to be moved towards and away from the body.
The neck is the part of the body that distinguishes the head from the torso or trunk.

Which of the following is the most complex joint?

  1. Freely movable

  2. Immovable

  3. Partially movable

  4. All of the above


Correct Option: A
Explanation:

Freely movable joints are the most complex of the joints. Freely movable joints come in different shapes and allow different movements. Six types of freely movable joints exist. The ball-and-socket joint, of which the shoulder is an example, has a ball-shaped head and allows the widest range of motion. The elbow is a hinge joint and is able to move in only one plane etc. Therefore, (a) is the correct answer. 

Which joint joins the bones with a joint capsule? 

  1. Immovable joint

  2. Slightly movable joint

  3. Synovial joint

  4. None of the above


Correct Option: C
Explanation:

A synovial joint joins bones with a fibrous joint capsule that is continuous with the periosteum of the joined bones, constitutes the outer boundary of a synovial cavity, and surrounds the bones' articulating surfaces. The synovial (or joint) cavity is filled with synovial fluid. They are the most common and most movable type of joint in the body of a mammal. 

Therefore, (c) is the correct answer.

Joints showing almost no or little movement are known as _______________. 

  1. Immovable joints

  2. Freely movable

  3. Slightly movable

  4. None of the above


Correct Option: A
Explanation:

An immovable joint is a place in the body where two bones are joined together but where little or no movement is normally possible and where no joint cavity exists. e.g. skull.

Which of the following would ensure healthy joints?

  1. Playing outdoor games

  2. Playing indoor games

  3. Eating more red meat

  4. Use of massage oil


Correct Option: A
Explanation:

Walking and playing in fresh air keeps the body fit and healthy. One must also have a balanced diet and maintain a healthy body weight.

Olecranon process is found in

  1. Proximal end of ulna

  2. Distal end of ulna

  3. Proximal end of tibia

  4. Proximal end of humerus


Correct Option: A
Explanation:

Ulna is produced into an oleander process, to articulate into olecranon fossa and tracheal of humerus by a hinge joint. 

Synovial fluid is present in

  1. Fibrous joint

  2. Cartilaginous joint

  3. Freely movable joint

  4. Intervertebral joint


Correct Option: C
Explanation:

Synovial fluid is present in perfect movable joints. The synovial membrane secretes synovial fluid which lubricates and provides nourishment to articular
cartilage.

Joints of skull bones are

  1. Synarthrosis

  2. Amiphiarthrosis

  3. Hemarthrosis

  4. Diarthrosis


Correct Option: A
Explanation:

A synarthrosis is a fixed joint between bones connected by fibrous tissue. A suture is a type of fibrous joint that is only found in the skull. The sutures between bones of the skull is an example of synarthrosis. So, the correct answer is 'Synarthrosis'. 

Sutural joints are present between

  1. Thumb and metatarsal

  2. Humerus and radius-ulna

  3. Parietals of skull

  4. Glenoid cavity and pectoral girdle


Correct Option: C
Explanation:
  • Joints are points of contact between bones, or between bones and cartilages.
  • A suture is a type of fibrous joint that is only found in the skull. Parietals are the bones present in the skull.
  • Sutural joints are present between parietals (bones of the skull)of the skull.
  • So, the correct answer is 'Parietals of the skull'.

Identify the correct description.

  1. First vertebra is axis which articulates with occipital condyles.

  2. Parietal bone and temporal bone of skull are jointed by fibrous joint.

  3. 9$^{th}$ and 10$^{th}$ pairs of ribs are called floating ribs.

  4. Glenoid cavity is depression to which thigh bone articulates.


Correct Option: B
Explanation:
  • Joints are points of contact between bones, or between bones and cartilages.
  • A suture is a type of fibrous joint that is only found in the skull. The skull bones are joined by the sutures.
  • Parietal bone and temporal bone are skull bones.
  • Hence parietal bone and temporal bone of skull are joined by fibrous joint.
  • So, the correct answer is 'Parietal bone and temporal bone of skull are joined by fibrous joint'.

The joint between the human skull bones is

  1. Hinge joint

  2. Immovable joint

  3. Cartilaginous joint

  4. Synovial joint


Correct Option: B
Explanation:

A suture is a type of fibrous joint that is only found in the skull. The bones are bound together by Sharpey's fibers. A tiny amount of movement is permitted at sutures, which contributes to the compliance and elasticity of the skull which is immovable.

So, the correct option is 'Immovable joint'.

The type of joint between the human skull bones is called:

  1. cartilaginous joint

  2. hinge joint

  3. fibrous joint

  4. synovial joint


Correct Option: C
Explanation:

The type of joint between the human skull bones is called 'fibrous joint'. So, the correct answer is (c).

Synovial joint is exemplified by:

  1. Pivot joint

  2. Hinge joint

  3. Ball and Socket joint

  4. All of these


Correct Option: D

Which one of the following is the correct description of a certain part of a normal human skeleton ?

  1. Parietal bone and the temporal bone of the skull are joined by fibrous joint.

  2. First vertebra is axis which articulates with the occipital condyles.

  3. The 9th and 10th pairs of ribs are.called the floating ribs.

  4. Glenoid cavity is a depression to which the thigh bone articulates.


Correct Option: A
Explanation:

Fibrous joints are connected by dense connective tissue consisting mainly of collagen, also called immovable joints.

So, the correct option is 'Parietal bone and the temporal bone of the skull are joined by fibrous joint.'.

Sutures are

  1. Movable joints

  2. Cracks in the skull bone

  3. Immovable joints

  4. Both B and C


Correct Option: D
Explanation:

A suture is a type of fibrous joint, which only occurs in the skull (or cranium). They are bound together by Sharpey's fibres. These joints are synarthroses. A small movement is permitted at sutures, which contributes to the compliance and elasticity of the skull.

If a ligament is cut or damaged the joint becomes

  1. Freely movable

  2. Immovable

  3. Unaffected

  4. Unstable


Correct Option: D
Explanation:

The connective tissues which are found around joints are the ligaments and this help to stabilise the joint, maximise its strength and prevent any excess movement of the joints. The ligaments are attached to both sides of the bones and any tear or injury to the ligaments tends to make the joints unstable. So, the correct answer is option D.

Which one of the following membranes secretes a watery fluid that lubricates and cushions the joint ?

  1. Tendons

  2. Ligaments

  3. Cartilage

  4. Synovial membrane


Correct Option: D
Explanation:

The synovial membrane is the membrane that lines the articular surfaces of the bones of the synovial joint. Its secretes a watery fluid that lubricates and cushions the joint. It reduces the friction during movement.

Tendon is a cord of strong fibrous collagen tissue that connects muscles to bones and doesn't secrete any fluid. 
The ligament is a band of flexible fibrous connective tissue that connects bone to bone and doesn't secret any fluid. 
Cartilage is a tough and flexible material that acts as a cushion between the bones of joints and doesn't secret any fluid. 
So the correct option is D.

Major constituent of human body is

  1. Skeleton

  2. Muscles

  3. Connective tissue

  4. Extracellular fluid


Correct Option: A
Explanation:

  • A skeleton is the hard structure that protects the internal organs of a living thing. 
  • Skeletons can be inside the body or outside the body. 
  • In mammals, which include humans, the skeleton is made of bones. 
  • All the bones, when they are joined together, make the "skeletal system" of a body. Hence, the major constituent of the human body is a skeleton.
So, the correct answer is 'skeleton'.

Which is not the function of bones?

  1. Protection of vital organs

  2. Haemopoiesis

  3. Muscle attachment

  4. Secretion of hormones


Correct Option: D
Explanation:

The endocrine glands in the body such as a pituitary gland, thymus, thyroid gland, parathyroid and etc secrete various hormones in the body. The bones cannot secrete hormones as they lack glands to produce and secrete hormones. It helps in protection of vital organs, haemopoiesis, and muscle attachment.

So, the correct answer is 'Secretion of hormones'.

Presence of obturator foramen is a feature of

  1. Frog

  2. Cockroach

  3. Rabbit

  4. None of the above


Correct Option: C

The function of skeleton in the vertebrates is/are

  1. Support

  2. Hearing

  3. Sound production

  4. All of the above


Correct Option: A
Explanation:

The skeleton is the structural framework of the body. Our skeleton system contains 206 bones. Its main function is to support muscles and tissues. It also protects the vital organs, allows movement of bones and muscles and serves as the storage house for immature blood cells and minerals.

So, the correct option is A.

Innominate is

  1. A nerve and an artery

  2. A nerve and a vein

  3. A vein and an artery

  4. A part of skeleton and an artery


Correct Option: D
Explanation:

Term innominate is used both in the context of a skeletal system and circulatory system. In the circulatory system, innominate is one of the branches of the aortic arch. The arch of the aorta, located immediately beyond the ascending aorta, gives off three large branches.
1. The brachiocephalic trunk is a short artery formerly called the innominate. Its name means that is supplies the head and the arm. After extending upward somewhat less than 5 cm (2 inches), it divides into the right subclavian artery, which supplies the right side of the head and the neck. 
2. The left common carotid artery extends upward from the highest part of the aortic arch. It supplies the left side of the neck and the head.
3. The left subclavian artery extends under the left collar bone (clavicle) and supplies the left upper extremity. This is the last branch of the aortic arch.
Innominate bone in anatomy refers to either of the two bones that form the sides of the pelvis, consisting of three fused components, the ilium, ischium, and pubis. The non-technical name is hip bone.

A snail moves with the help of its

  1. Shell

  2. Wings

  3. Bristle

  4. Feet


Correct Option: D
Explanation:

A snail uses its single long, muscular foot to crawl on a layer of mucus-like slime that it secretes. This mucus has unusual physical properties and scientists assumed that these sticky properties were essential for snail movement. 

Therefore, the correct answer is option D.

Skeleton is the site of

  1. Regulation

  2. Haemoglobin

  3. Haematopoiesis

  4. None of the above


Correct Option: C
Explanation:

  • The skeleton is the site of haematopoiesis, the development of blood cells that takes place in the bone marrow. 
  • In children, haematopoiesis occurs primarily in the marrow of the long bones such as the femur and tibia. 
  • In adults, it occurs mainly in the pelvis, cranium, vertebrae, and sternum. Hence, the Skeleton is the site of Haematopoiesis.
So, the correct answer is 'Haematopoiesis'.

Sesamoid bones are commonly found in ______________.  

  1. Vertebral column

  2. Ribs

  3. Skull

  4. Palm of hands


Correct Option: D
Explanation:

Sesamoid bones develop in some tendons in locations where there is considerable friction, tension and physical stress. They are typically found in palm of hands and soles of feet. Therefore, (d) is the correct answer. 

Innominate is

  1. nerve and artery

  2. A muscle and artery

  3. Skeleton part and artery

  4. A nerve and vein


Correct Option: C
Explanation:

  1. Innominate is used to designate many parts otherwise unnamed.
  2. Innominate artery is a great part of the arch of the aorta.
  3. The innominate bone is the hip bone which is part of the skeleton system
Hence option c is correct

Ribs attached to sternum are

  1. First seven pairs

  2. All ten ribs

  3. First ten rib pairs

  4. First five rib pairs


Correct Option: A
Explanation:

There are usually 12 pairs of ribs in human body, first seven pairs of ribs are known as true ribs because these are attached to sternum.

Total number of bones in the hind limb of a man is

  1. 14

  2. 21

  3. 24

  4. 30


Correct Option: D
Explanation:

Each hind limb contains 30 bones namely femur in thigh, patella inthe knee, tibia and fibula in the lower leg, 7 tarsals in the ankle, 5 meta-tarsals in the sole and 14 phalanges in toes.

A cricket player is chasing a ball. Which group of muscles is contributing in this movement

  1. Femur, Malleus, Tibia, Metatarsals

  2. Pelvis, Ulna, Patella, Tarsals

  3. Sternum, Femur, Tibia, Fibula

  4. Tarsals, Femur, Metatarsals, Tibia


Correct Option: D
Explanation:
  • Hindlimb is composed of  Femur (thigh bone – the longest bone), tibia and fibula, tarsals (ankle bones – 7 in number), metatarsals (5 in number) and phalanges (digits – 14 in number).
  • When a cricket player is chasing a ball it represents he is running. during running hind limbs assist motion hence muscles off hind limbs contribute to the motion.
  • Hence when a cricket player is chasing a ball. the group of muscles which contribute to this movement are tarsals, femur, metatarsals, tibia.
  • So, the correct answer is 'Tarsals, femur, metatarsals, tibia'.

In which bones shall have Haversian system ___________.

  1. Panther

  2. Python

  3. Pigeon

  4. Pipe Fish


Correct Option: A
Explanation:

  • The osteon or Haversian system is the fundamental functional unit of much compact bone. 
  • Osteons are roughly cylindrical structures. 
  • Presence of the Haversian system is a typical character of mammalian bone. Panther is a mammal. Hence, bones of panther shall have a Haversian system.
So, the correct answer is 'panther'.

Which is the longest bone in human body?

  1. Humerus

  2. Stapes

  3. Femur

  4. Radio-ulna


Correct Option: C
Explanation:
The longest bone in the human body is the femur or thigh bone which contains about 1/4 of the height of an adult. The femur is also the strongest bone in the human body. So, the correct answer is 'Femur'.

Joint between humerus and radio-ulna is

  1. Ball and socket

  2. Pivot

  3. Gliding

  4. Hinge


Correct Option: D
Explanation:

A hinge joint is a common class of synovial joint that includes the ankle, elbow and knee joints. Hinge joints are formed between two or more bones where the bones can only move along one axis to fold or extend. The elbow is a more complex hinge joint that forms between the humerus of the upper arm and the ulna and radius of the forearm. So, the correct answer is 'Hinge'.

Radius is bone of

  1. Arm

  2. Leg

  3. Pelvic girde

  4. Cranium


Correct Option: A
Explanation:
  • The bones of the arm or forelimb are humerus, radius and ulna, carpals (wrist bones – 8 in number), metacarpals (palm bones – 5 in number) and phalanges (digits – 14 in number).
  • Hence radius is bone of arm.
  • So, the correct answer is 'Arm'.

Ulna is a

  1. Long and curved bone

  2. Small slender bone

  3. Very small bone

  4. Very long bone


Correct Option: A
Explanation:
  • The bones of the hand (forelimb) are humerus, radius and ulna, carpals (wrist bones – 8 in number), metacarpals (palm bones – 5 in number) and phalanges (digits – 14 in number),
  • The ulna is a long and curved bone.
  • Proximally, the ulna articulates with the humerus at the elbow joint. Distally, the ulna articulates with the radius, forming the distal radio-ulnar joint.
  • So, the correct answer is 'Long and curved bone'.

Acetabulum is formed at the point of fusion of bones

  1. Ilium, Ischium

  2. lschium and pubis

  3. Ilium, pubis

  4. Ilium, Ischium, pubis


Correct Option: D
Explanation:

There are three bones of the hip bone that come together to form the acetabulum. Two-fifths of the structure is the ischium, which provides lower and side boundaries to the acetabulum. The ilium forms the upper boundary, providing a little less than two-fifths of the structure of the acetabulum. The rest is formed by the pubis, near the midline.

So, the correct option is 'Ilium, Ischium, Pubis'.

Identify the joints, which are freely movable.

  1. Fibrous joints

  2. Symphyses

  3. Synovial joints

  4. Cartilaginous joints


Correct Option: C
Explanation:

A synovial joint is a connection between two bones consisting of a cartilage lined cavity filled with fluid. Synovial joints are capable of the greatest movement. Knees, elbows and shoulders are examples of synovial joints. Since they allow for free movement, synovial joints are classified as diarthrosis. They allow for many types of movement including gliding, angular, rotational etc. So, the correct answer is 'Synovial joints'.

Which of the following is an immovable joint?  

  1. Joint in the arm

  2. Joints between teeth

  3. Joint between vertebrae

  4. All of the above


Correct Option: B
Explanation:

There are several examples of these joints in the human body, including joints between the bones of the skull, joints in the pelvis and joints between the teeth and the mandible, or lower jaw, and the maxilla, or upper jaw. Another name for immovable joins is a synarthrosis, which simply means immovable. The two types of immovable joints are fibrous joints and cartilaginous joints.

Therefore, (b) is the correct answer. 

The place where two bones meet is called a __________.

  1. skull

  2. joint

  3. ligament

  4. tendon


Correct Option: B
Explanation:

In the joint there is a fluid which acts as a llubricant. This fluid is called the synovial fluid.

Which one of the following is not a bone of the human leg?

  1. Fibula

  2. Femur

  3. Humerus

  4. Tibia


Correct Option: C
Explanation:

The humerus is the long bone in the upper arm. It is located between the elbow joint and the shoulder. So, the correct option is C.( Humerus )

 Ribs protect the 

  1. Lungs

  2. Brain

  3. None of the above

  4. All of the above


Correct Option: A
Explanation:

Ribs serve to protect the lungs, heart, and other internal organs of the thorax. In some animals, especially snakes, ribs may provide support and protection for the entire body.

Therefore, the correct answer is option A.

Major functions of skeleton are

  1. Support

  2. Protection

  3. Storage of ions

  4. All of the above


Correct Option: D
Explanation:

The skeleton serves a number of functions in vertebrates:

(1) The skeleton forms a rigid framework, which gives support to the body against gravity.
(2) The skeleton encloses the more vital organs of the body to protect them from injury.
(3) Bones contain deposits of calcium phosphate and calcium carbonate. These may be released into the blood if needed for use elsewhere in the body, but are later replaced. This helps in regulating calcium and phosphorus level of blood. 
So, the correct answer is option D.

The brain is protected by the 

  1. Vertebrae

  2. Cranium

  3. Ribs

  4. Sternum


Correct Option: B
Explanation:

  • The skull is composed of two parts: the cranium and the mandible.
  •  In the human, cranium has two parts the neurocranium and the viscerocranium. 
  • The neurocranium forms the cranial cavity that surrounds and protects the brain and brainstem. 
  • The neurocranium consists of the occipital bone, two temporal bones, two parietal bones, the sphenoid, ethmoid, and frontal bones—all are joined together with sutures. Hence, The brain is protected by the Cranium.
So, the correct answer is 'Cranium'.

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