In order for transmission across the synapse to occur
A) synaptic vesicles fuse with the postsynaptic membrane.
B) neurotransmitters are released from the postsynaptic membrane.
C) synaptic vesicles fuse with the presynaptic membrane.
D) neurotransmitters are actively transported from the presynaptic to the postsynaptic membrane.
E) the postsynaptic membrane must be in the refractory period.

Question

Quizplus · Accepted Answer

Synaptic transmission occurs when synaptic vesicles in the presynaptic neuron fuse with the presynaptic membrane, causing neurotransmitters to be released into the synaptic cleft. These neurotransmitters then bind to receptors on the postsynaptic membrane, leading to a response in the postsynaptic neuron. Option A is incorrect because synaptic vesicles fuse with the presynaptic membrane, not the postsynaptic membrane. Option B is incorrect because neurotransmitters are released from the presynaptic membrane, not the postsynaptic membrane. Option D is incorrect because neurotransmitters are released from the presynaptic neuron and diffuse across the synaptic cleft to bind to receptors on the postsynaptic membrane, they are not actively transported. Option E is incorrect because the refractory period is a period of time following an action potential during which the membrane is less responsive to stimuli, it is not necessary for synaptic transmission to occur.

In Order for Transmission Across the Synapse to Occur