Physiology: Venous Return and Cardiac Output
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Questions and Answers

Which physiological variable reflects the degree of distension of the circulation with blood?

  • Mean systemic filling pressure (MSFP) (correct)
  • Venous resistance
  • Right atrial pressure
  • Cardiac output

    • What is the volume of blood that flows back to the heart per minute known as?

  • Venous resistance
  • Cardiac output (correct)
  • Arterial return
  • Venous pressure

    • What determines the interaction between mean systemic filling pressure (MSFP), right atrial pressure (RAP), and resistance to venous return (RVR)?

  • The venous return curve
  • Cardiac output
  • Pressure gradient for venous return (correct)
  • The pressure gradient for arterial return

    • What is the pressure that drives the venous return?

    <p>Mean systemic filling pressure (MSFP)</p> Signup and view all the answers

    What happens to venous return if the right atrial pressure is high?

    <p>Decreases</p> Signup and view all the answers

    What is the equation for venous return according to Ohm's law as provided in the text?

    <p>Venous Return (VR) = 𝐌𝐒𝐅𝐏 + 𝐑𝐀𝐏 ‒ 𝐑𝐕𝐑</p> Signup and view all the answers

    Which of the following is NOT a physiological variable that determines venous return?

    <p>Left atrial pressure</p> Signup and view all the answers

    What does the resistance to venous return (RVR) represent?

    <p>The vascular resistance to venous blood flow back to the heart</p> Signup and view all the answers

    What happens to the flow of venous blood back to the heart if the mean systemic filling pressure is increased?

    <p>It increases</p> Signup and view all the answers

    Under normal conditions, what is the relationship between venous return and cardiac output?

    <p>Venous return is equal to cardiac output</p> Signup and view all the answers

    What is the effect of increased resistance to venous return on the flow of venous blood back to the heart?

    <p>It decreases the flow</p> Signup and view all the answers

    What is the purpose of the venous return curve?

    <p>To study the interaction between MSFP, RAP, and RVR</p> Signup and view all the answers

    What is the result of a high right atrial pressure on the flow of venous blood back to the heart?

    <p>It decreases the flow</p> Signup and view all the answers

    What is the relationship between the pressure gradient for venous return and the flow of venous blood back to the heart?

    <p>The pressure gradient drives the flow</p> Signup and view all the answers

    What is the net effect of an increase in mean systemic filling pressure and a decrease in right atrial pressure on the flow of venous blood back to the heart?

    <p>It increases the flow</p> Signup and view all the answers

    What is the role of Ohm's law in the regulation of venous return?

    <p>It describes the relationship between pressure gradient and flow</p> Signup and view all the answers

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