The sarcoplasmic reticulum
A)stores ACh.
B)is located within the neuromuscular junction.
C)envelops the sarcomere-containing myofibrils.
D)is a contractile protein.

Question

Quizplus · Accepted Answer

The sarcoplasmic reticulum is a specialized type of smooth endoplasmic reticulum that wraps around the myofibrils, which contain the sarcomeres. It is responsible for regulating intracellular calcium levels and releasing calcium ions during muscle contraction. It does not store ACh, is not located within the neuromuscular junction, and is not a contractile protein.

The Sarcoplasmic Reticulum