Question

what is the name of the network of membranous channels that surrounds each myofibril within a muscle fiber?
golgi apparatus
sarcoplasmic reticulum
transverse tubules
endomysium
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Explanation:

The sarcoplasmic reticulum is a network of membranous channels that surrounds each myofibril within a muscle fiber. It stores and releases calcium ions which are crucial for muscle contraction. The Golgi apparatus is involved in modifying, sorting, and packaging proteins and lipids. Transverse tubules are invaginations of the muscle cell membrane that help in the rapid transmission of electrical signals. The endomysium is the connective - tissue layer that surrounds individual muscle fibers.

Answer:

B. Sarcoplasmic reticulum