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 inhibitors, although some may act as inhibitors.

[Review Part 1 of the tutorial] [Review Part 2 (Matching) of the tutorial]