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Question

Which of the following is true of muscle contraction?

A
H-zone expands
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B
I-band expands
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C
A-Band remains constant
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D
The sarcomeres expands
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Solution

The correct option is C A-Band remains constant
  • Upon muscle contraction, the A-bands do not change their length, whereas the I-bands and the H-zone shorten.
  • This causes the Z lines to come closer together. The protein [tropomyosin] covers the myosin binding sites of the actin molecules in the muscle cell. Hence, A-Band remains constant is true of muscle contraction
  • So, the correct answer is 'A-Band remains constant'.

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