Whether a synapse is excitatory or inhibitory depends on the
A) size of the synapse.
B) presynaptic axon terminal.
C) type of neurotransmitter.
D) nature of the postsynaptic receptors.
E) concentration of neurotransmitter in the synaptic space.

Question

Quizplus · Accepted Answer

The nature of the postsynaptic receptors is what determines whether a synapse is excitatory or inhibitory. Excitatory synapses have receptors that, when activated by a neurotransmitter, cause the postsynaptic neuron to depolarize, or become more positive, and increase the likelihood of an action potential. Inhibitory synapses have receptors that, when activated by a neurotransmitter, cause the postsynaptic neuron to hyperpolarize, or become more negative, and decrease the likelihood of an action potential. The size of the synapse, presynaptic axon terminal, type of neurotransmitter, and concentration of neurotransmitter in the synaptic space can all play a role in the strength and duration of the synaptic effect, but they do not determine whether the synapse is excitatory or inhibitory.

Whether a Synapse Is Excitatory or Inhibitory Depends on the