Tag: coordination

Questions Related to coordination

Match column I with column, option from. the codes given below:

Column I Column II
A. Structural and functional -unit of a myofibril (i) H-zone
B. Protein of thin filament (ii) Myosin
C. Protein of thick filament (iii) Sarcomere
D. The central part of thick filament not overlapped by thin filament (iv) Actin
biology locomotion and movements structure of muscle skeletal muscles coordination

  1. A-(i), B-(ii), C,(iii), D-(iv)

  2. A-(i), B-(iii), C-(ii), D-(iv)

  3. A-(i), B-(iv), C-(iii), D-(ii)

  4. A-(iii),B-(iv), C-(ii), D-(i)

Show answer
Correct Option: D
Explanation:

 A. Structural and functional -unit of a myofibril - (iii) Sarcomere

B. Protein of thin filament - (iv) Actin

C. Protein of thick filament - (ii) Myosin

D. The central part of thick filament not overlapped by thin filament - (i) H-zone

So, the correct answer is 'A-(iii),B-(iv), C-(ii), D-(i)'.

Dark bands are :

biology locomotion and movements structure of muscle skeletal muscles coordination

  1. A-band

  2. B-band

  3. I-band

  4. Z--line

Show answer
Correct Option: A
Explanation:
A-bands in muscles are the dark bands that are located in the regions where thick myosin filaments are present.
So, the correct answer is 'A-band'.

The functional unit of contractile system in a striated muscle is 

biology locomotion and movements structure of muscle skeletal muscles coordination

  1. sarcomere

  2. Z-band

  3. cross bridges

  4. myofibril

Show answer
Correct Option: A
Explanation:

The sarcomeres are fibrous protein filaments that slide past one another when the muscle contracts or relaxes. It is basically the region between two Z-bands. It is also the functional unit of the contractile system in a striated muscle.

So, the correct answer is 'sarcomere'.

Read the given statements and select the correct option.
Statement 1 : A primary myofilament is composed of a bundle of rod-like molecules of a protein myosin.
Statement 2 : Myosin and actin together form a contractile apparatus. 

biology locomotion and movements structure of muscle skeletal muscles coordination

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.

Show answer
Correct Option: A
Explanation:
Both the statements given in the question are correct as a primary myofilament is composed of a bundle of rod-like molecules of a protein myosin and myosin and actin together form a contractile apparatus.
So, the correct answer is '
Both statements 1 and 2 are correct.'

Each myofibril has a diameter of.

biology locomotion and movements structure of muscle skeletal muscles coordination

  1. $1$ to $2$ $\mu$m

  2. $0.1$ to $0.2$ $\mu$m

  3. $.001$ to $.002$ $\mu$m

  4. None of the above

Show answer
Correct Option: A

Myosin filaments are thick and are made up of small units called meromyosin. Each meromyosin globular head with short arm called ____________.

biology locomotion and movements structure of muscle skeletal muscles coordination

  1. Heavy meromyosin

  2. Light meromycin

  3. Both a and b

  4. None of these

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Correct Option: A

Which of the.following statements are correct regarding muscle proteins ?
 (i) Actin is a thin filament and is Frock up of two F-actirs.
(ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin. 
(iii)  Myosin is a thick flament which is also a polymerised protein. 
(iv) The globular head of meromyosin consists of light merornyosin (LMM).

biology locomotion and movements structure of muscle skeletal muscles coordination

  1. (i), (ii) and (iii)

  2. (i), (ii) and (iv)

  3. (i) and (iii)

  4. (ii) and (iv)

Show answer
Correct Option: A
Explanation:

Actin is the thin filament in the sarcomere, comprising F-actin, tropomyosin and troponin protein, troponin is attached to tropomyosin, while myosin is a thick filament.

So, the correct option is '(i), (ii) and (iii)'.

What is the main function of endocrinal system in animals?

zoology coordination introduction to human endocrine system endocrine system and hormone coordination in human beings- chemical control

  1. Coordination

  2. Combination

  3. Regulatory

  4. None of the given

Show answer
Correct Option: A
Explanation:

The function of endocrine glands in animals is to regulate chemical coordination. These glands secrete chemicals called hormones. 

So, the correct option is 'Coordination'.

Endocrine glands are also called as ................. glands.

zoology coordination introduction to human endocrine system endocrine system and hormone coordination in human beings- chemical control

  1. Exocrine

  2. Ductless

  3. Ducted

  4. None of the above

Show answer
Correct Option: B
Explanation:

Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct. So, they are called as ductless glands. 

The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands.

Endocrine glands

zoology coordination introduction to human endocrine system endocrine system and hormone coordination in human beings- chemical control

  1. Do not possess ducts

  2. Sometimes do not have ducts

  3. Pour their secretion into blood through ducts

  4. Always have ducts

Show answer
Correct Option: A
Explanation:

Any of various glands producing hormonal secretions that pass directly into the bloodstream is called endocrine gland. The endocrine glands include the thyroid, parathyroids, anterior and posterior pituitary, pancreas, adrenals, pineal and gonads. They are also called as the ductless glands.