Blood Viscosity and Hemorrhage Quiz
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Questions and Answers

Which of the following is the most important factor that determines the blood flow in a vessel?

  • The viscosity of the blood
  • The cardiac output of the left ventricle
  • The pressure gradient between the beginning and end of the vessel (correct)
  • The length of the vessel

    • Which of the following is the primary mechanism of metabolic autoregulation of blood flow?

  • Increased blood viscosity
  • Autoregulation of the arteriolar diameter (correct)
  • Increased cardiac output
  • Vasodilation of the venules

    • How does an increase in hematocrit affect blood viscosity and blood flow?

  • Decreases viscosity, increases flow
  • Has no effect on viscosity or flow
  • Increases viscosity, increases flow
  • Increases viscosity, decreases flow (correct)

    • Which of the following vasoactive substances is most likely to cause vasodilation of the arterioles?

    <p>Nitric oxide</p> Signup and view all the answers

    What is the relationship between the radius of a vessel and its resistance to blood flow?

    <p>Resistance is inversely proportional to the fourth power of the radius</p> Signup and view all the answers

    Which of the following is the most important mechanism by which the body can autoregulate blood flow to meet the metabolic needs of a tissue?

    <p>Dilating the arterioles</p> Signup and view all the answers

    What is the main site of peripheral resistance in the circulatory system?

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

    How does increased diameter of blood vessels affect resistance in the circulatory system?

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

    What type of blood flow helps eliminate energy losses in the circulatory system?

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

    In cases of mild narrowing due to atherosclerosis, what happens to blood flow?

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

    How do small changes in arteriolar diameter affect blood flow in the body?

    <p>Lead to major changes in flow</p> Signup and view all the answers

    Which factor has a less significant effect on blood viscosity compared to hematocrit?

    <p>Concentration of plasma proteins</p> Signup and view all the answers

    Which of the following is the most important trigger for the continuous generation of a vasodilator substance?

    <p>Increased shear stress on the blood vessel wall</p> Signup and view all the answers

    Which of the following is the main site of action for the vasodilator substance generated in response to increased shear stress?

    <p>Large diameter arterioles</p> Signup and view all the answers

    How do vasodilator drugs (e.g., Nitrovasodilators) affect the heart?

    <p>They decrease the venous return and preload, and decrease the arterial blood pressure and afterload</p> Signup and view all the answers

    Which of the following vasoactive substances is the most potent vasoconstrictor?

    <p>Endothelin-1</p> Signup and view all the answers

    What is the balance between Thromboxane A2 and Prostacyclin (PGI2) important for?

    <p>Maintaining a localized clot without excessive extension, which maintains blood flow</p> Signup and view all the answers

    How does autoregulation of blood flow to some tissues work?

    <p>The blood flow is adjusted to match the metabolic activities of the tissue, and remains constant despite changes in arterial blood pressure</p> Signup and view all the answers

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