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