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. is released from synaptic vesicles.
D. exits through voltage-gated channels and triggers transmitter release.
E. exits through active transport pumps and brings transmitter with it.
Answer: B
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