Item #3 of 15

When a neural impulse reaches the end of an axon, it causes the tiny sacs at the end of the axon to release chemicals called ____________.

stimulants;
inhibitors;
neurotransmitters;
ions;
hormones;

INCORRECT - The substances released into the synaptic cleft are not called ions, although ions are essential to the membrane changes that underlie synaptic transmission.

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