The figure is a process figure of the chemical synapse. What does "D" represent?
A) Postsynaptic membrane
B) Synaptic cleft
C) Synaptic vesicle
D) Voltage-gated Ca²⁺ channel
E) Presynaptic terminal

Chemical Synapse

A specialized junction through which neurons signal to each other and to non-neuronal cells, allowing ion or molecule movements that facilitate neurotransmission.

Presynaptic Terminal

The part of a neuron that releases neurotransmitters into the synaptic cleft to communicate with a neighboring neuron.

Postsynaptic Membrane

The term describes the part of a neuron that receives signals from another neuron at a synapse.