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 (B)</p> Signup and view all the answers

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

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

What is preload?

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

What is venous return?

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

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

<p>Venous return decreases (C)</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 (A)</p> Signup and view all the answers

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

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

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

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

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

<p>Flow rate will increase (A)</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 (C)</p> Signup and view all the answers

Which of the following correctly defines conductance?

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

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

<p>Turbulent flow (D)</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 (C)</p> Signup and view all the answers

According to the text, what causes vasodilation?

<p>Hormones and metabolites (D)</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 (A)</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. (D)</p> Signup and view all the answers

What is the formula for calculating ejection fraction?

<p>SV/EDV (B)</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. (A)</p> Signup and view all the answers

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

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

What causes an increase in systolic blood pressure during exercise?

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

What is the formula for calculating pulse pressure?

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

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

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

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