When an impulse arrives at the knob of the motor neuron, calcium

A.  enters through active transport pumps and triggers the release of transmitter.
B.  enters through voltage-gated channels and triggers the release of transmitter.
C.  exits through active transport pumps and brings transmitter with it.
D.  exits through voltage-gated channels and triggers transmitter release.
E.  is released from synaptic vesicles.


B

Anatomy & Physiology

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