The following is a diagram of a sarcomere. How do the labelled parts change during muscle contraction?
Correct answer: C. "B" shortens
- A. "D" shortens
- B. "C" stays the same
- C. "B" shortens
- D. Two "A"s move further away
Explanation
A sarcomere is defined as the distance between two consecutive Z discs or Z lines; when a muscle contracts, the distance between the Z discs is reduced. The H zone-the central region of the A zone-contains only thick filaments and is shortened during contraction. This is correct. D is the sarcomere, a represents Z line, b represents A zone, c represents z disc.
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