allerySignals between two neurons across a chemical synapse are transmitted by
Adirect electrical contact
Bneurotransmitters released into the synaptic cleft
Cdiffusion of Na⁺ ions
Dpassive heat exchange
Answer & Solution
Correct answer: B. neurotransmitters released into the synaptic cleft
The action potential triggers vesicles in the axon terminal to release neurotransmitter into the cleft.
The neurotransmitter diffuses to receptors on the next neuron, generating a postsynaptic potential.
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