Calcium does not play an important role in the process of neurotransmitter release

Both A and B are true

The use of calcium is more efficient at peptidergic synapses as compared to non-peptidergic synapses

Large amounts of calcium are always found in the axon terminal to allow for continuous release of transmitter

Calcium entry into the axon terminal is regulated by voltage-gated channels which are found in active zones on the terminal membrane