Answer:
4) to aid in the transmission of an impulse, neurotransmitters are secreted into a synapse
To help in the transmission of an impulse, neurotransmitters are secreted into a synapse, i.e., option 4.
The location of transmission of nerve impulses either between two nerve cells or a neuron and a gland or muscle cell is referred to as a synapse.
It usually secrete a chemical that helps in the signal transduction, these are called as neurotransmitters.
Thus, the correct option is 4.
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