Q: Which of these is found at the two ends of a sarcomere?  

Answer: D

The sarcomere is the basic unit of a muscle cell responsible for muscle contraction. The ‘Z’ line is a protein structure that marks the two ends of a sarcomere. It appears as a thin, dark line in the center of the ‘I’ band, which is the light band of the sarcomere. The ‘Z’ line is important because it serves as the attachment point for actin filaments, which make up the thin filaments of the sarcomere.
The ‘Z’ line is not a static structure, as it can move during muscle contraction. When the muscle contracts, the ‘Z’ line moves closer together, causing the sarcomere to shorten. This shortening of the sarcomere leads to the overall shortening of the muscle fiber, resulting in muscle contraction.

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