Calcium Plays an Important Role in Release of Neurotransmitters

Calcium plays an important role in release of neurotransmitters. Calcium

A) is released from ER stores when the neuronal axon is depolarized
B) must bind the axon cytoskeleton to assist movement of neurotransmitter-containing vesicles toward the axon synapse
C) enters the axon through ligand-gated channels when extracellular neurotransmitters are available
D) enters the axon through voltage-gated channels when the axon is depolarized
E) None of the above is correct