At an excitatory chemical synapse between two neurons
A. there is increased permeability of the postsynaptic cell to both Na+ and K+.
B. an action potential in the presynaptic neuron always causes an action potential in the postsynaptic neuron.
C. a small hyperpolarization of the postsynaptic membrane occurs when the synapse is activated.
D. excitation occurs because K+ enters the postsynaptic cell.
E. action potentials spread through gap junctions between cells.
Answer: A
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