A new theory of autonomic neurotransmission says that most postganglionic fibers release two substances to transmit an impulse.

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This is true. According to the new theory of autonomic neurotransmission, most postganglionic fibers release two substances, commonly known as cotransmitters, to transmit an impulse. The two substances work together to produce a coordinated physiological response in the target organ or tissue. This theory was proposed as a result of the discovery of the presence of multiple neurotransmitters in many autonomic nerve terminals.

A New Theory of Autonomic Neurotransmission Says That Most Postganglionic