Presynaptic facilitation occurs when
A) extracellular concentration of sodium increases.
B) extracellular concentration of potassium increases.
C) calcium channels in the presynaptic membrane are inhibited.
D) calcium channels in the presynaptic membrane remain open longer.
E) temporal summation occurs.

Question

Quizplus · Accepted Answer

Presynaptic facilitation occurs when calcium channels in the presynaptic membrane remain open longer. This allows for an increased influx of calcium ions, which in turn increases the release of neurotransmitters into the synaptic cleft, leading to facilitation of synaptic transmission.

Presynaptic Facilitation Occurs When