Regulation of Heart Rate and Blood Pressure Mechanisms
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Questions and Answers

What is the range of blood pressure that stimulates arterial baroreceptors?

  • 30-150 mmHg
  • 20-80 mmHg
  • 60-180 mmHg (correct)
  • 100-200 mmHg

    • What happens to the rate of discharge of arterial baroreceptors when blood pressure exceeds 180 mmHg?

  • It fluctuates
  • It remains the same
  • It increases rapidly
  • It decreases (correct)

    • What type of impulses do atrial receptors discharge during atrial systole?

  • Type C: parasympathetic impulses
  • Type B: excitatory impulses
  • Type D: sympathetic impulses
  • Type A: inhibitory impulses (correct)

    • What stimulates atrial receptors located in the wall of both atria?

    <p>Increase in central venous pressure</p> Signup and view all the answers

    What is the function of arterial baroreceptors during rest?

    <p>They discharge continuous inhibitory impulses</p> Signup and view all the answers

    How do atrial receptors regulate central venous pressure when volume receptors increase?

    <p>Increase the rate of discharge to inhibit VCC</p> Signup and view all the answers

    Which area of the medullary cardiovascular centres is responsible for vasoconstriction, leading to an increase in arterial blood pressure?

    <p>Vasoconstrictor centre</p> Signup and view all the answers

    What effect does the stimulation of the Cardiac Stimulatory Centre have on arterial blood pressure?

    <p>Increases ABP</p> Signup and view all the answers

    Which mechanism acts through the kidneys to regulate arterial blood pressure?

    <p>Hormonal mechanism</p> Signup and view all the answers

    Which centre sends inhibitory impulses to the Vasoconstrictor Centre to counteract vasoconstriction?

    <p>Vasodilator centre</p> Signup and view all the answers

    What is the main function of the Cardiac Inhibitory Centre in the medullary cardiovascular centres?

    <p>Inhibits the heart rate</p> Signup and view all the answers

    What effect does Venoconstriction have on arterial blood pressure?

    <p>Increases ABP</p> Signup and view all the answers

    What is the mechanism of the Bainbridge reflex?

    <p>Stimulation of atria stretch receptors leads to tachycardia.</p> Signup and view all the answers

    What is the effect of inhibition of secretion of ADH and aldosterone on Na+ excretion?

    <p>Increased excretion of Na+</p> Signup and view all the answers

    How does increased right atrial pressure affect heart rate through the Bainbridge effect?

    <p>Local stretch of S.A. node leads to tachycardia.</p> Signup and view all the answers

    What is the function of peripheral chemoreceptors in response to stimuli like hypoxia?

    <p>Send excitatory impulses to stimulate the pressor area</p> Signup and view all the answers

    How does distension of the left ventricle affect heart rate through baroreceptors?

    <p>Leads to bradycardia and drop in blood pressure</p> Signup and view all the answers

    How does inhibition of aldosterone secretion affect blood volume and arterial blood pressure?

    <p>Decreases blood volume and arterial blood pressure</p> Signup and view all the answers

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