Tag: structure and function of brain

Questions Related to structure and function of brain

The brain is responsible for

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Thinking

  2. Regulating the heart beat

  3. Balancing the body

  4. All of the above

Show answer
Correct Option: D
Explanation:

The cerebellum is the convoluted subdivision of brain stem and is associated with coordination of muscular movement, muscle tone and balance. Medulla oblongata controls consciousness and arousal (the reticular formation) and its cardiovascular reflex centre controls heartbeat. The cerebrum is the largest and uppermost division of brain. It is the centre for higher thought processes required for learning, memory, language and speech. The correct answer is D.

Select the correct option:

Blood-brain barrier in adults has ........... junctions between cells.

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Tight

  2. Adhering

  3. Gap

  4. None of these

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Correct Option: A
Explanation:

The blood-brain barrier is a dynamic conduit for transport taking place between brain and blood. The blood vessels and brain are lined with endothelial cells that are wedged tightly together, creating a nearly impermeable boundary.

the blood-brain barrier helps block harmful substances from entering the brain.
So the correct option is 'Tight'.

Assertion: In man, only peripheral nervous system is present.

Reason: The peripheral nervous system includes nerves coursing between the central nervous system and different parts of the body.

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. If both the assertion and the reason are true and the reason is the correct explanation of the assertion

  2. If both the assertion and the reason are true and the reason is not the correct explanation of the assertion

  3. If the assertion is true and the reason is false

  4. If both the assertion and the reason is false

  5. If the assertion is false but the reason is true

Show answer
Correct Option: E
Explanation:

The nervous system of human comprises of Central Nervous System - comprises of brain and spinal cord. Peripheral Nervous System - comprises of nerves present between brain and body parts.

Endorphin release is stimulated by

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Sleep

  2. Endogenous rhythm

  3. Exercise

  4. Carotene-rich food

Show answer
Correct Option: C
Explanation:
Endomorphins are the chemical substance which is present in the neurons. It helps in the perception of pain, reactions to stress, and cardiovascular, respiratory and digestive functions. They are produced within the body so they are known as endogenous. They specifically work by binding to opoid receptors which are mainly found in nervous system and regulates the motor neurons which helps to coordinate the physical activity.
So, the correct answer is option C.

The human brain weight approximately ..........% of the body weight.

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. 1%

  2. 2%

  3. 5%

  4. 10%

Show answer
Correct Option: B
Explanation:
The adult human brain weighs about 3 pounds (1,300-1,400 g). The adult human brain is about 2 % of the total body weight. The average human brain is 140 mm wide.
So, the correct answer is 2%.

During period of starvation, the following organ is most likely to decrease in size? 

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Brain

  2. Heart

  3. Thymus

  4. None of these

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Correct Option: A

Brain is the main .......... centre of the body.

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Peripheral

  2. Nervous

  3. Chemical

  4. Physical

Show answer
Correct Option: B
Explanation:

The brain serves as the center of the nervous system in all vertebrates and most invertebrate animals. Only a few invertebrates, such as sponges,  jellyfish, adult sea squirts and starfish do not have a brain.In such organisms, a diffuse neural tissue is present. It is located in the head, usually close to the primary sensory organs for such senses as vision, hearing, balance, taste and smell. The brain is the most complex organ in a vertebrate's body. 

The cavities of brain are lined by

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Cuboidal cells

  2. Polygonal cells

  3. Ependymal cells

  4. Simple squamous cells

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Correct Option: C
Explanation:

Ependymal cells are the cube-shaped epithelial cells that forms the epithelial lining of the cavities in brain and central canal of spinal cord. These cells are formed from a layer of embryonic tissue known as neuroectoderm and secrete cerebrospinal fluid for mechanical protection.

Thus, the correct answer is option C.

Human brain is covered by

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Two meninges

  2. Three meninges

  3. Five meninges

  4. None of the above

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Correct Option: B
Explanation:

Meninges are the membranes that envelop the brain and spinal cord of the central nervous system. 

In mammals, the meninges consist of three layers - dura mater, arachnoid mater and pia mater. The primary function of the meninges and of the cerebrospinal fluid is to protect the central nervous system.

Which of the following is correct?

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Spinal cord is a part of central nervous system.

  2. Nerves are continuous fibres.

  3. Reflexes are not controlled by nerves.

  4. None of the above.

Show answer
Correct Option: A
Explanation:

The spinal cord is a part of the central nervous system. The most important structure between our body and our brain is the spinal cord. It extends from the foramen magnum, where it is continuous with the medulla to the level of the first or second lumbar vertebrae. It is a vital link not only from the brain to the body but also from the body to the brain. The spinal cord is 40 to 50 cm long and 1 cm to 1.5 cm in diameter.