Arterial Blood Flow and Peripheral Resistance Quiz
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Questions and Answers

Which of the following factors affects resistance to blood flow?

  • Arterial pressure
  • Cardiac output
  • Total peripheral resistance (correct)
  • All of the above

What is the equation for arterial pressure according to Guyton?

  • Arterial pressure = cardiac output + total peripheral resistance
  • Arterial pressure = total peripheral resistance / cardiac output
  • Arterial pressure = cardiac output x total peripheral resistance (correct)
  • Arterial pressure = cardiac output / total peripheral resistance

What is the equation for Reynolds number (Re)?

  • Re = (velocity of flow) / (radius of vessel) x viscosity
  • Re = (velocity of flow) + (radius of vessel) x viscosity
  • Re = (velocity of flow) x (radius of vessel) / viscosity (correct)
  • Re = (velocity of flow) / (radius of vessel) / viscosity

What does Reynolds number (Re) indicate about fluid flow?

<p>Whether flow is laminar or turbulent (A)</p> Signup and view all the answers

Which of the following is likely to increase Reynolds number (Re) and result in turbulent flow?

<p>Abnormal vessel wall (A)</p> Signup and view all the answers

What is the effect of flow on viscosity?

<p>Static blood has higher viscosity than flowing blood (C)</p> Signup and view all the answers

What is the equation for Reynolds number (Re) according to the text?

<p>Re = (velocity of flow) x (radius of vessel) / viscosity (C)</p> Signup and view all the answers

According to LaPlace's Law, the tension (T) in the vessel wall is proportional to the distending pressure (P) and the radius (R) of the vessel. Which of the following equations represents this relationship correctly?

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

Which of the following is NOT a practical consequence of LaPlace's Law?

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

Which of the following is NOT a site of tissue blood flow regulation?

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

Which of the following is NOT a mechanism of regulation of tissue blood flow?

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

Which of the following is NOT an example of acute regulation of local blood flow?

<p>Change in physical size of blood vessels (A)</p> Signup and view all the answers

Which of the following is NOT a basic principle of circulatory function?

<p>The cardiac output is controlled by local tissue flows (D)</p> Signup and view all the answers

Which of the following is a specialized flow mentioned in the text?

<p>Flow in the lungs (D)</p> Signup and view all the answers

Which of the following is NOT a learning outcome mentioned in the text?

<p>Describing short-term mechanisms of microcirculation regulation (A)</p> Signup and view all the answers

Which of the following is a learning outcome mentioned in the text?

<p>To describe the ionic basis for the different stages of the membrane potential changes in atrial/ventricular muscle (C)</p> Signup and view all the answers

What is the effect of flow on viscosity?

<p>Flow has no effect on viscosity (A)</p> Signup and view all the answers

Which of the following is NOT a mechanism of regulation of tissue blood flow?

<p>Metabolic regulation (A)</p> Signup and view all the answers

What is the equation for arterial pressure according to the text?

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

What does Reynolds number (Re) indicate about fluid flow?

<p>Re indicates the turbulent flow of fluid (A)</p> Signup and view all the answers

Which of the following is NOT a basic principle of circulatory function?

<p>Blood flow is directly proportional to vessel radius (C)</p> Signup and view all the answers

What is the equation for Reynolds number (Re) according to the text?

<p>Re = (density x velocity x diameter) / viscosity (C)</p> Signup and view all the answers

Which of the following is the correct order of the phases of a cardiac action potential?

<p>Phase 0, Phase 1, Phase 2, Phase 3, Phase 4 (C)</p> Signup and view all the answers

Which of the following is responsible for the rapid depolarization in Phase 0 of a cardiac action potential?

<p>Increased Na+ permeability (gNa+) (D)</p> Signup and view all the answers

Which of the following is responsible for the start of repolarization in Phase 1 of a cardiac action potential?

<p>Closing of fast Na+ channels (B)</p> Signup and view all the answers

Which of the following is responsible for the effect of Ca2+ entry in Phase 2 of a cardiac action potential?

<p>L-type channels (D)</p> Signup and view all the answers

Which of the following is responsible for the rapid repolarization in Phase 3 of a cardiac action potential?

<p>Opening of K+ channels (C)</p> Signup and view all the answers

Which of the following is responsible for the stable resting membrane potential in Phase 4 of a cardiac action potential?

<p>Excess gK+ over gNa+ (C)</p> Signup and view all the answers

Which of the following is responsible for the positive chronotropic effect of sympathetic stimulation on pacemaker activity?

<p>Increased cAMP production (A)</p> Signup and view all the answers

Which of the following is responsible for the negative chronotropic effect of parasympathetic stimulation on pacemaker activity?

<p>Decreased cAMP production (C)</p> Signup and view all the answers

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