CVS Practice Test

Norepinephrine is typically released from postganglionic sympathetic neurons as part of the sympathetic nervous system's response to stress or danger. In this system, the postganglionic neurons transmit signals from the ganglia to target organs and tissues, playing a crucial role in the "fight or flight" response by regulating heart rate, blood pressure, and other involuntary bodily functions.

This function is distinct from afferent neurons, which are responsible for conveying sensory information to the central nervous system, and from pre-ganglionic neurons, which release acetylcholine rather than norepinephrine. Motor neurons, on the other hand, are primarily involved in transmitting signals to muscles to induce movement, again unlike the role of norepinephrine which is involved in modulating autonomic functions. The specificity of postganglionic sympathetic neurons in releasing norepinephrine reinforces their critical role in activating and regulating the body's stress response systems.