Question

question 5
neurotransmitters are released from the:
a synaptic cleft
b epineurium
c presynaptic terminal
d calcium channels
e postsynaptic membrane

Explanation:

Neurotransmitters are chemical messengers in the nervous system. The presynaptic terminal (also known as the axon terminal) is the part of a neuron from which neurotransmitters are released. When an action potential reaches the presynaptic terminal, it triggers the release of neurotransmitters into the synaptic cleft (the space between neurons). The synaptic cleft is where neurotransmitters diffuse to reach the postsynaptic membrane (the membrane of the next neuron or target cell). The epineurium is a connective - tissue layer around nerves. Calcium channels are involved in the process of neurotransmitter release (calcium influx into the presynaptic terminal is a trigger for release), but the neurotransmitters are stored and released from the presynaptic terminal, not from the calcium channels themselves.

Answer:

C. presynaptic terminal