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Read the following statements about muscle contraction in humans :

i. chemical energy is converted into mechanical energy during muscle contraction and the chemical is a neurotransmitter.

ii. a neurotransmitter acetylcholine at motor end plate converts electrical energy into mechanical energy.

iii. in a contracted muscle, volume remains the same.

iv. a contracted muscle becomes shorter and thicker.

  • a)
    only iv) is correct.

  • b)
    only i), iii) and iv) are correct.

  • c)
    only i) and iv) are correct.

  • d)
    only ii), iii) and iv) are correct.

Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Read the following statements about muscle contraction in humans :i. c...
The chemical energy is converted into mechanical energy during muscle contraction and the chemical is a neurotransmitter. In a contracted muscle, volume remains the same and a contracted muscle becomes shorter and thicker.
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Most Upvoted Answer
Read the following statements about muscle contraction in humans :i. c...
Explanation:
Muscle contraction is a complex process that involves the conversion of chemical energy into mechanical energy. Let's analyze each statement to understand why option 'B' is the correct answer.

i. Chemical energy is converted into mechanical energy during muscle contraction, and the chemical is a neurotransmitter.
During muscle contraction, chemical energy stored in the form of adenosine triphosphate (ATP) is converted into mechanical energy. ATP is the primary energy source for muscle contraction. The release of a neurotransmitter called acetylcholine initiates the process of muscle contraction by transmitting the electrical signal from the nervous system to the muscle fibers.

ii. A neurotransmitter acetylcholine at the motor end plate converts electrical energy into mechanical energy.
This statement is incorrect. Acetylcholine released at the motor end plate does not directly convert electrical energy into mechanical energy. It acts as a chemical messenger that binds to receptors on the muscle fibers, triggering a series of events that lead to muscle contraction. The electrical energy from the nerve impulse is converted into a chemical signal (acetylcholine) which then initiates the release of calcium ions from the sarcoplasmic reticulum, leading to muscle contraction.

iii. In a contracted muscle, volume remains the same.
This statement is incorrect. During muscle contraction, the volume of the muscle decreases. As the muscle fibers generate force, they pull on the tendons, causing the muscle to shorten. This shortening leads to a decrease in muscle volume.

iv. A contracted muscle becomes shorter and thicker.
This statement is correct. When a muscle contracts, it becomes shorter and thicker. The individual muscle fibers slide past each other, causing the overlapping actin and myosin filaments to shorten. This sliding filament mechanism is responsible for muscle contraction. As the muscle fibers shorten, the muscle as a whole becomes thicker.

Based on the explanations above, we can conclude that only statements i), iii), and iv) are correct. Hence, the correct answer is option 'B' - only i), iii), and iv) are correct.
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Read the following statements about muscle contraction in humans :i. chemical energy is converted into mechanical energy during muscle contraction and the chemical is a neurotransmitter.ii. a neurotransmitter acetylcholine at motor end plate converts electrical energy into mechanical energy.iii. in a contracted muscle, volume remains the same.iv. a contracted muscle becomes shorter and thicker.a)only iv) is correct.b)only i), iii) and iv) are correct.c)only i) and iv) are correct.d)only ii), iii) and iv) are correct.Correct answer is option 'B'. Can you explain this answer?
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