Card 28 / 34: What happens at the neuromuscular junction after acetylcholine has been released into the motor end plate?
A) Calcium ions rush into the cytosol and bind to the troponin.
B) Impulse travels T-tubules and sarcoplasmic reticulum.
C) Calcium is actively transported from the cytosol into the SR by ion pumps.
D) Acetylcholine binds with receptor sites on motor end plate, causing depolarization of motor end plate and sarcolemma.

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