Once a signal molecule has left the neuron and binds to a receptor molecule on the surface of the muscle fiber, a sodium channel opens, allowing more sodium entry into the muscle fiber and the creation of an action potential. Which substance is then released from the sarcoplasmic reticulum?

A) calcium
B) acetylcholine
C) sodium
D) sodium and potassium


Answer: A) calcium

Anatomy & Physiology

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