Questions: In a contracting muscle, the Z lines come closer together. True or False

In a contracting muscle, the Z lines come closer together. True or False
Transcript text: In a contracting muscle, the Z lines come closer together. True or False
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Solution

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The answer is True: In a contracting muscle, the Z lines come closer together.

Explanation:

  • In muscle contraction, the sarcomere, which is the functional unit of a muscle fiber, shortens. The Z lines (or Z discs) are the boundaries of each sarcomere.
  • During contraction, the actin and myosin filaments slide past each other, causing the sarcomere to shorten and the Z lines to move closer together.
  • This process is part of the sliding filament theory, which explains how muscles contract at the molecular level.

Therefore, the statement is true.

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