Which neurotransmitter stimulates free nerve endings at the site of an injury and also increases neural messages within the spinal cord?

Question

Quizplus · Accepted Answer

Substance P is a neuropeptide that is released by nociceptive neurons in response to tissue damage or inflammation. It stimulates free nerve endings at the site of injury, causing pain and inflammation. Substance P also increases neural messages within the spinal cord, transmitting information about tissue damage or inflammation to the brain. The other neurotransmitters listed (acetylcholine, serotonin, and endorphins) are not typically involved in the transmission of pain signals.

Which Neurotransmitter Stimulates Free Nerve Endings at the Site of an Injury