What makes nitric oxide unique among neurotransmitters?
A) It is released before the action potential occurs.
B) It is taken back up into the presynaptic neuron.
C) It is a gas.
D) It is composed of amino acids.

Question

Quizplus · Accepted Answer

Nitric oxide is unique among neurotransmitters because it is a gas. Other neurotransmitters are chemical substances that are released from the presynaptic neuron into the synaptic cleft and interact with receptors on the postsynaptic neuron. Nitric oxide, on the other hand, can diffuse across cell membranes and interact with receptors and other cellular components beyond the synaptic cleft.

What Makes Nitric Oxide Unique Among Neurotransmitters