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Excitation Contraction Coupling

Which of the ...

Question

Which of the following changes occur when skeletal muscle contracts?

A

The A- bands shorten

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B

The I- bands shorten

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C

The Z- lines move further apart

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D

The H- zone becomes more visible

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Solution

The correct option is B
The I- bands shorten

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.

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Excitation Contraction Coupling

Standard XII Biology

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