Which of the following is the first step for synaptic signalling when the action potential arrives at the axon terminal of a presynaptic neuron
A)A neurotransmitter is released by exocytosis.
B)Calcium flows in the synaptic knob.
C)The neurotransmitter combines with protein receptor sites on the subsynaptic membrane.
D)The permeability is altered in a postsynaptic neuron.

Question

Quizplus · Accepted Answer

The first step for synaptic signaling when the action potential arrives at the axon terminal of a presynaptic neuron is that calcium flows into the synaptic knob. This influx of calcium triggers the release of neurotransmitters by exocytosis. The neurotransmitter then combines with protein receptor sites on the subsynaptic membrane, leading to a change in permeability in a postsynaptic neuron.

Which of the Following Is the First Step for Synaptic