In a simple synapse, neurotransmitter chemicals are released by the presynaptic membrane.
Your body cannot function without chemical messengers called neurotransmitters. They are responsible for transmitting chemical signals from one neuron (nerve cell) to the subsequent target cell. The following target cell may be a gland, muscle, or another nerve cell.
An axon terminal's presynaptic membrane is a particular region of its membrane that confronts the plasma membrane of the neuron or muscle fibre with which it forms a synaptic connection. The terminal button of an axon shapes the presynaptic membrane.
Hence, Option B is correct. In a simple synapse, neurotransmitter chemicals are released by the presynaptic membrane.
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