Which of the following factors has the most influence on how long pain lasts and how intense it is?
a. the person's past experience with pain
b. how much pain medication the person takes at one time
c. the release of chemical mediators such as substance P
d. the person's history of pain medication use and tolerance to medications
C
Feedback
A Incorrect: The person's past experience with pain may affect how long pain lasts and how intense it is, but it is not the factor with most influence.
B Incorrect: How much pain medication the person takes at one time has not been identified as a factor that influences how long pain lasts and how intense it is.
C Correct: Substance P, a neuropeptide, sensitizes the nerve endings and increases the rate of firing. Thus, substance P is influential on how long pain lasts and the intensity of the pain experience.
D Incorrect: The person's history of pain medication use and tolerance to medications has not been identified as a factor that influences how long pain lasts and how intense it is.
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