At an Excitatory Chemical Synapse Between Two Neurons

question 65

Multiple Choice

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.

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