An Application of Capsaicin to the Skin or Muscles Causes

question 218

Multiple Choice

An application of capsaicin to the skin or muscles causes first a burning sensation and then a prolonged decrease in pain sensations. Why?

• A) At first capsaicin increases the flow of sodium across the membranes of pain neurons, but eventually the body runs out of sodium ions.
• B) Capsaicin releases the pain neurotransmitter, substance P, faster than it can be resynthesized.
• C) At first capsaicin damages endorphin synapses, but later they recover.
• D) Capsaicin stimulates blood flow to the skin or muscles, but also prevents the blood from leaving the area.

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