The intracellular stimulus for secretion of neurotransmitters into the synaptic cleft is an increase in:. a. chloride ion levels.
b. potassium ion levels.
c. calcium ion levels.
d. acetylcholine levels.
e. sodium ion levels.

The intracellular stimulus for the secretion of neurotransmitters into the synaptic cleft is an increase in calcium ion levels (Option c).

In conclusion, the intracellular stimulus for the secretion of neurotransmitters into the synaptic cleft is an increase in calcium ion levels (Option c).

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C. calcium ion levels.

Explanation:

Calcium enters the axon terminal during an action potential,

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