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Anonymous
When a muscle contracts, the actin and myosin myofilaments come together, the H zones and I zones shrink and become very narrow. The A band does not changing during contraction.
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Prosomes form sarcomere-like banding patterns in skeletal, cardiac, and smooth muscle cells.Actin and Myosin proteins
A muscle that contracts shortens whereas a muscle that relaxes lengthens.
The Diaphragm.
The banding pattern visible in striated muscle is due to the arrangement of thick and thin filaments within muscle fibers. The alternating dark A bands (containing thick filaments) and light I bands (containing thin filaments) create the striated appearance. This banding pattern is essential for the function of muscle contraction.
A muscle becomes shorter when it contracts.
When a muscle contracts, it shortens in length.
When a muscle contracts, it pulls with a force generated by the muscle fibers contracting and shortening.
When one muscle in a pair contracts the other expands.
Flexion
shortens
The muscle that contracts when the leg is extended at the knee is call the gastrocnemius muscle