Which of the following does NOT occur in response to baroreceptors detecting an increase in mean arterial pressure?Question 3Select one:a.Decreased heart rateb.Decreased venous compliancec.Decreased end diastolic volume.d.Decreased frequency of sinoatrial node action potentialse.Vasoconstriction
Question
Which of the following does NOT occur in response to baroreceptors detecting an increase in mean arterial pressure?Question 3Select one:a.Decreased heart rateb.Decreased venous compliancec.Decreased end diastolic volume.d.Decreased frequency of sinoatrial node action potentialse.Vasoconstriction
Solution
The correct answer is b. Decreased venous compliance.
Here's why:
Baroreceptors are sensors located in the blood vessels of the body. They detect changes in blood pressure and send signals to the brain to help regulate the body's response to these changes.
When baroreceptors detect an increase in mean arterial pressure, several responses are triggered to lower the blood pressure:
a. Decreased heart rate: This reduces the amount of blood being pumped by the heart, which can help to lower blood pressure.
c. Decreased end diastolic volume: This refers to the amount of blood in the ventricles at the end of diastole (when the heart is relaxed). A decrease in this volume can reduce the pressure in the arteries.
d. Decreased frequency of sinoatrial node action potentials: The sinoatrial node is the natural pacemaker of the heart. Decreasing the frequency of its action potentials can slow the heart rate, which can help to lower blood pressure.
e. Vasoconstriction: This is the narrowing of the blood vessels, which increases resistance to blood flow and can help to lower blood pressure.
b. Decreased venous compliance, however, does not occur in response to an increase in mean arterial pressure. Venous compliance refers to the ability of the veins to expand and accommodate more blood. If venous compliance were to decrease, this would actually increase blood pressure, not lower it. Therefore, this is not a response to increased mean arterial pressure.
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