mjl1717
Forum Hero
Topics: 958
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answer -b
Glossopharyngeal is the sensory part (afferent)
Vagus is the motor(efferent)(parasympathetics decrease H.R.)
Also b is the only answer doing pt any good! (without syncope)
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| kris2c
Forum Senior
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The correct answer is B.
The glossopharyngeal nerve (CN IX) and the vagus nerve (CN X) carry afferent information to the medulla from the carotid sinus and aortic arch baroreceptors, respectively.
The firing rate of these neurons increases with increasing blood pressure.
Therefore, by artificially increasing the firing rate of these nerves, the medulla receives a false signal that indicates that the blood pressure is too high. This elicits a baroreceptor reflex, resulting in a decrease in sympathetic outflow and an increase in parasympathetic outflow, which leads to bradycardia and hypotension.
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Kris2c
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