Understanding Stroke Volume and its Relationship to EDV and ESV
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Questions and Answers

Which of the following is true about stroke volume (SV)?

  • SV is the volume of blood pumped per beat (correct)
  • SV is the volume of blood returned to the heart
  • SV is the volume of blood in the right ventricle
  • SV is the volume of blood in the left ventricle

    • What happens to the stroke volume (SV) when the end-diastolic volume (EDV) increases?

  • SV remains the same
  • SV cannot be determined
  • SV increases (correct)
  • SV decreases

    • What happens to the stroke volume (SV) when the end-systolic volume (ESV) decreases?

  • SV remains the same
  • SV cannot be determined
  • SV increases (correct)
  • SV decreases

    • What is the stroke volume (SV) if the end-diastolic volume (EDV) is 110 mL and the end-systolic volume (ESV) is 20 mL?

    <p>90 mL</p> Signup and view all the answers

    What is the average stroke volume (SV) per beat?

    <p>70 mL</p> Signup and view all the answers

    What is preload?

    <p>The degree of stretching experienced by the heart muscle cell during diastolic</p> Signup and view all the answers

    What is venous return?

    <p>The blood that returns to the heart</p> Signup and view all the answers

    How does gravity affect venous return?

    <p>Gravity affects the amount of blood getting returned to the heart</p> Signup and view all the answers

    What is the muscle pump?

    <p>The mechanism that helps return blood to the heart during standing and running</p> Signup and view all the answers

    What happens to venous return when transitioning from lying down to standing?

    <p>Venous return decreases</p> Signup and view all the answers

    According to Poiseuille's Law, which of the following factors has the greatest influence on blood flow rate?

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

    According to the text, if pressure increases, what will happen to resistance?

    <p>Resistance will increase</p> Signup and view all the answers

    Which of the following is the correct equation for calculating flow rate?

    <p>Q = P/R</p> Signup and view all the answers

    According to the text, what happens to flow rate when resistance decreases?

    <p>Flow rate will increase</p> Signup and view all the answers

    According to the text, what is the relationship between viscosity and flow rate?

    <p>More viscosity leads to a decrease in flow rate</p> Signup and view all the answers

    Which of the following correctly defines conductance?

    <p>Flow rate divided by pressure</p> Signup and view all the answers

    According to Reynold's number, which type of flow is faster in smaller vessels?

    <p>Turbulent flow</p> Signup and view all the answers

    According to the text, what is shear stress?

    <p>Force applied to make one plane move relative to the other</p> Signup and view all the answers

    According to the text, what causes vasodilation?

    <p>Hormones and metabolites</p> Signup and view all the answers

    According to the text, what is the relationship between vasomotion and blood flow?

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

    Which of the following is true about the Frank-Starling mechanism?

    <p>It causes the heart to contract harder due to increased stretch in the ventricles.</p> Signup and view all the answers

    What is the formula for calculating ejection fraction?

    <p>SV/EDV</p> Signup and view all the answers

    What is the main role of the parasympathetic nervous system in heart rate control?

    <p>It causes heart rate to decrease.</p> Signup and view all the answers

    What is the formula for calculating mean arterial pressure (MAP)?

    <p>MAP = ⅓ systolic + ⅔ Diastolic</p> Signup and view all the answers

    What causes an increase in systolic blood pressure during exercise?

    <p>Increase in cardiac output</p> Signup and view all the answers

    What is the formula for calculating pulse pressure?

    <p>DBP + (⅓ PP)</p> Signup and view all the answers

    What is the main role of the sympathetic nervous system in heart rate control?

    <p>It causes heart rate to increase.</p> Signup and view all the answers

    What is the main role of the muscle pump during standing and running?

    <p>To increase stroke volume</p> Signup and view all the answers

    What is the main cause of a decrease in stroke volume during heavy exercise?

    <p>Decreased venous return</p> Signup and view all the answers

    What is the formula for calculating the heart rate-pressure product (RPP)?

    <p>RPP = SBP x HR</p> Signup and view all the answers

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