An individual hiking in the forest encounters a large poisonous snake on the path. Which change in this individual's vital signs is most likely?
a. Pulse rate changes from 90 to 72.
b. Respiratory rate changes from 22 to 18.
c. Complaints of intestinal cramping begin.
d. Blood pressure changes from 114/62 to 136/78.
ANS: D
This frightening experience would stimulate the sympathetic nervous system, causing a release of norepinephrine, an excitatory neurotransmitter. It prepares the body for fight or flight. Increased blood pressure, pupil size, respiratory rate, and pulse rate signify release of norepinephrine. Intestinal cramping would be associated with stimulation of the parasympathetic nervous system.
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Which drug is a selective alpha-1 blocker?
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The loss of feeling or sensation produced by a drug is:
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