In peripheral tissues which of the following contains substance P______________?
Correct answer: C. Nerve terminal
- A. Plasma cell
- B. Mast cell
- C. Nerve terminal
- D. Vascular endothelium
Explanation
Substance P is a neuropeptide released mainly from peripheral sensory nerve terminals, especially nociceptors, where it contributes to pain transmission and neurogenic inflammation. Mast cells release histamine rather than being the usual source of substance P.
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