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When Ca²⁺ ions combine with troponin contraction of muscles initiates. During contraction the Z lines come closer together and the sarcomere becomes shorter. The length of A band remains constant. I bands shortens and H-band narrows.

1. When Ca²⁺ ions combine with troponin contraction of muscles initiates.
2. During contraction the Z lines come closer together and the sarcomere becomes shorter.
3. The length of A band remains constant.
4. I bands shortens and H-band narrows.

Correct answer: When Ca²⁺ ions combine with troponin contraction of muscles initiates.

Solution

The binding of Ca²⁺ ions to troponin triggers muscle contraction.

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