ANIMAL REPRODUCTIVE PHYSIOLOGYintermediate
Which of the following is a defining characteristic of a neurotransmitter? (Select all that apply.)
Answer
It is a chemical messenger released by a neuron to transmit signals across a synapse to a target cell.
Explanation
The definition includes a **chemical**, passage across a **synapse**, and signaling from one neuron to another target neuron. It does not describe communication between different species; that would contradict the neuron-to-neuron definition given in this section.\n\n**Key takeaway:** The defining features are chemical transmission, a synapse, and a neuronal target.\n\n**Glossary:** **Chemical signal**: A molecule that conveys information; **synapse**: The junction crossed during neuronal signaling.
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