Question

increased calcium ion permeability of the presynaptic terminal cell membrane is caused by an
multiple choice
acetylcholine
action potential
increased concentration of calcium ions
sodium ions

Explanation:

When an action potential reaches the presynaptic terminal, it causes voltage - gated calcium channels to open, increasing the calcium ion permeability of the presynaptic terminal cell membrane. Acetylcholine is a neurotransmitter, increased calcium ion concentration is a result not a cause of increased permeability, and sodium ions are not directly responsible for this increased calcium permeability.

Answer:

B. Action potential