When the Nervous System Signals a Muscle to Contract, the ________

Question

When the nervous system signals a muscle to contract, the ________ ion channels open.
A)Phosphorus
B)Sodium
C)Myosin
D)Actin

Accepted Answer

When the nervous system signals a muscle to contract, the sodium ion channels open, which allows sodium ions to enter the muscle cell, leading to depolarization and ultimately muscle contraction.