When a person rises quickly from a lying position, there is
A) an increase in the frequency of action potentials produced by the baroreceptors.
B) an increase in vasomotor sympathetic stimulation to the blood vessels causing vasoconstriction.
C) reflexive slowing of the heart.
D) an increase of parasympathetic stimulation of the heart.
E) a decrease in heart rate and stroke volume.

Question

Quizplus · Accepted Answer

When a person rises quickly from a lying position, the immediate response of the body includes an increase in vasomotor sympathetic stimulation to the blood vessels, causing vasoconstriction. This helps to maintain blood pressure by increasing peripheral resistance, compensating for the sudden change in posture and the potential decrease in venous return to the heart.

When a Person Rises Quickly from a Lying Position, There