Neurotransmitter for pain is: (A) Dopamine, (B) Substance P, (C) PAF, (D) None
Answer is B. Substance P a polypeptide neurotransmitter that stimulates vasodilation and contraction of intestinal and other smooth muscles. It also plays a pa in salivary secretion, diuresis, natriuresis, and pain sensation. It has been isolated from ceain cells of the GI and biliary tracts.Ref: Ganong&;s review of medical physiology 23rd edition Page no: 143