Which of the following structures shortens when a muscle contracts

Asked by admin @ in Biology viewed by 300 People

Identify what structures in a skeletal muscle will shorten in length during contraction of the muscle. choose all that apply. (0.5 pts)

a. the skeletal muscle itself (the whole muscle organ)
b. muscle fascicle
c. muscle fiber
d. myofibril and. sarcomere f. thin filament g. thick filament

Answered by admin @


Answer:

b. muscle fascicle

c. muscle fiber

d. myofibril and. sarcomere

Explanation:

When muscle contracts, the myosin and actin filaments slide antiparallel to one another hence shortening the distance between the adjacent Z-lines of  a sarcomere (a functional unit of striated muscle). Technically, nonetheless, the filaments do not shorten. A chain of sarcomeres make up a myofibril. Myofibrils bound together in bundles around a sarcolemma make up a muscle fiber. Several muscle fibers bundled together in an endomysium make up a fascicle. Several fascicles bound together in a perimysium make up a muscle. A muscle has blood vessels and innervated nerves that serve the cells and are bound overall by an epimysium.

The blood vessels and nerves in the muscle do not contract.


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