The main role of calcium ions at chemical synapses is to
A) depolarize the axon terminal of the presynaptic cell.
B) bind to neurotransmitter receptors on the postsynaptic cell.
C) cause fusion of synaptic vesicles with the plasma membrane of the axon terminal.
D) interfere with IPSPs in the postsynaptic cell.
E) diffuse across the synaptic space and enter the postsynaptic cell.

Question

Quizplus · Accepted Answer

Calcium ions are responsible for triggering the release of neurotransmitters from the presynaptic cell by causing fusion of synaptic vesicles with the plasma membrane of the axon terminal. Once released, neurotransmitters bind to receptors on the postsynaptic cell, leading to a response in that cell. Therefore, calcium ions play a critical role in the overall communication between neurons at chemical synapses.

The Main Role of Calcium Ions at Chemical Synapses Is