In the spinal cord, Substance P is released to modulate what?

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Substance P in the spinal cord acts as a key transmitter for transmitting and modulating pain signals. When tissue is injured, small-diameter afferent fibers release Substance P in the dorsal horn, where it binds to neurokinin-1 receptors on second-order neurons. This increases the excitability of these neurons and enhances the transmission of nociceptive information up toward the brain, contributing to heightened pain sensitivity (hyperalgesia) and related sensations. The other options don’t fit this role: motor control involves motor pathways and neurotransmitters like acetylcholine, while visual and auditory processing occur in brain regions specialized for those senses, not in the spinal cord’s pain pathways.