Slow Control Mechanisms in the Cardiovascular System
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Questions and Answers

What is the role of baroreceptors in the cardiovascular system?

  • To sense changes in blood pressure and send signals to the medullary cardiovascular control center (correct)
  • To control the parasympathetic output only
  • To exclusively regulate sympathetic neuron activity
  • To send signals directly to the heart for contractility control

    • How do sympathetic neurons influence blood vessels in the cardiovascular system?

  • By decreasing the heart rate
  • By controlling parasympathetic output
  • By constricting blood vessels through alpha-adrenergic receptors (correct)
  • By causing vasodilation

    • What effect does norepinephrine have on blood vessels in the absence of sympathetic signals?

  • Causes vasodilation (correct)
  • Does not impact vessel diameter
  • Increases heart rate
  • Causes vasoconstriction

    • How do sympathetic signals affect venous return in the cardiovascular system?

    <p>By squeezing the venous bag to send blood back to the heart (A)</p> Signup and view all the answers

    What is the role of baroreceptors in the cardiovascular system?

    <p>Sensing changes in blood pressure (C)</p> Signup and view all the answers

    How does the cardiovascular system respond to an increase in blood pressure?

    <p>Vasodilate blood vessels and decrease cardiac output (B)</p> Signup and view all the answers

    Where are carotid baroreceptors located?

    <p>In the walls of the carotid arteries (D)</p> Signup and view all the answers

    What happens to baroreceptor firing rate when blood pressure increases?

    <p>Firing rate increases (C)</p> Signup and view all the answers

    How does the cardiovascular system respond to a decrease in blood pressure?

    <p>Decrease cardiac output and vasodilate blood vessels (B)</p> Signup and view all the answers

    What is the function of aortic baroreceptors in the body?

    <p>Monitoring blood pressure to the body (C)</p> Signup and view all the answers

    What is the purpose of slowly deflating the cuff during blood pressure measurement?

    <p>To listen for the first Korotkoff sound (D)</p> Signup and view all the answers

    Which artery is commonly used to measure blood pressure?

    <p>Radial artery (C)</p> Signup and view all the answers

    What does 'pulse pressure' represent in blood pressure readings?

    <p>Difference between systolic and diastolic pressure (B)</p> Signup and view all the answers

    In the context of blood pressure readings, what does a diastolic pressure of 80mmHg indicate?

    <p>Normal blood pressure (C)</p> Signup and view all the answers

    What does measuring the pulse rate help determine?

    <p>The strength of the circulating blood (B)</p> Signup and view all the answers

    Why is it important to measure blood pressure at 'pressure points'?

    <p>To ensure accurate and easily palpable pulse readings (D)</p> Signup and view all the answers

    What is the formula for Mean Arterial Pressure (MAP) as mentioned in the text?

    <p>(diastolic P + systolic P) / 2 (B)</p> Signup and view all the answers

    Which factor primarily determines the diameter of blood vessels according to the text?

    <p>Resistance in arterioles (A)</p> Signup and view all the answers

    What happens to blood pressure when blood volume decreases?

    <p>It decreases (A)</p> Signup and view all the answers

    Which system controls blood volume by regulating salt and water retention?

    <p>Renin-angiotensin-aldosterone system (B)</p> Signup and view all the answers

    What happens to Mean Arterial Pressure (MAP) when there is an increase in cardiac output?

    <p>MAP increases (D)</p> Signup and view all the answers

    What is the main function of Aldosterone in the body according to the text?

    <p>Regulates salt and water retention (D)</p> Signup and view all the answers

    How does constriction in arterioles affect blood pressure?

    <p>Increases blood pressure (C)</p> Signup and view all the answers

    Which system controls blood volume by regulating salt and water retention?

    <p>Renin-angiotensin-aldosterone system. (A)</p> Signup and view all the answers

    How does constriction in arterioles affect blood pressure?

    <p>Increases blood pressure. (D)</p> Signup and view all the answers

    What is the main function of Aldosterone in the body according to the text?

    <p>Regulates salt and water retention. (B)</p> Signup and view all the answers

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