In a chemical synapse,
A) action potentials in the presynaptic terminal cause voltage-gated Ca2+ channels to open.
B) neurotransmitters can cause ligand-gated Na+ channels to open.
C) neurotransmitters can be broken down by enzymes.
D) neurotransmitters can be taken up by the presynaptic terminal.
E) all of the above.
Answer: E) all of the above.
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