Physiology of CVS Lecture 5 Quiz
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Questions and Answers

What is the main function of the peripheral chemoreceptors in regulating blood pressure?

  • To increase cardiac output and vasoconstriction in response to hypoxia and acidosis (correct)
  • To have no effect on blood pressure regulation
  • To both increase and decrease blood pressure depending on the stimulus
  • To decrease cardiac output and vasodilation in response to hyperoxia and alkalosis

    • How does the capillary fluid shift mechanism help regulate blood pressure?

  • It can both increase and decrease blood pressure by altering capillary hydrostatic pressure and fluid shifts (correct)
  • It only increases blood pressure by decreasing fluid filtration and increasing reabsorption
  • It has no effect on blood pressure regulation
  • It only decreases blood pressure by increasing fluid filtration and decreasing reabsorption

    • What is the nervous connection between the peripheral chemoreceptors and the regulation of blood pressure?

  • The aortic bodies are innervated by the 10th nerve, and the carotid bodies are innervated by the 9th nerve (correct)
  • The aortic bodies are innervated by the 9th nerve, and the carotid bodies are innervated by the 10th nerve
  • The peripheral chemoreceptors are not directly connected to the nervous system for blood pressure regulation
  • Both the aortic and carotid bodies are innervated by the 8th nerve

    • What is the initial response of the peripheral chemoreceptors to a drop in blood pressure due to hemorrhage?

    <p>They stimulate vasoconstriction and increase cardiac output to raise blood pressure (B)</p> Signup and view all the answers

    How does the capillary fluid shift mechanism help regulate blood pressure during changes in blood volume?

    <p>It can both increase and decrease blood pressure by altering capillary hydrostatic pressure and fluid shifts (C)</p> Signup and view all the answers

    What is the primary function of the arterial baroreceptors?

    <p>To send inhibitory impulses to the vasoconstrictor center during periods of high blood pressure (B)</p> Signup and view all the answers

    Which cranial nerve carries the afferent impulses from the carotid sinus baroreceptors?

    <p>Glossopharyngeal nerve (9th cranial nerve) (B)</p> Signup and view all the answers

    What is the effect of decreased arterial blood pressure on the pressor area of the brainstem?

    <p>The pressor area becomes released from inhibition, leading to increased heart rate, stroke volume, and vasoconstriction (C)</p> Signup and view all the answers

    What is the relationship between arterial blood pressure and the rate of discharge from the arterial baroreceptors?

    <p>The rate of discharge is maximal at 180 mmHg, and does not increase further with higher pressures (B)</p> Signup and view all the answers

    What is the primary reflex pathway activated by the carotid sinus baroreceptors in response to increased arterial blood pressure?

    <p>Increased inhibition of the vasoconstrictor center (C)</p> Signup and view all the answers

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