Sydney Medical School: Cardiovascular System Lecture 7 Quiz
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Questions and Answers

What is the primary role of capillaries in the microcirculation?

  • Generating blood flow velocity
  • Producing white blood cells
  • Transporting nutrients and oxygen to tissues (correct)
  • Regulating blood pressure

    • How does blood flow velocity differ from blood flow in the context of microcirculation?

  • Blood flow velocity is the same as blood pressure, while blood flow refers to heart rate.
  • Blood flow velocity represents the volume of blood moved per unit time, while blood flow is the pressure exerted by the blood on vessel walls.
  • Blood flow velocity depends on vessel size, while blood flow does not.
  • Blood flow velocity refers to the speed of blood in a specific vessel, while blood flow is the overall movement of blood in the circulatory system. (correct)

    • Why does an increase in total surface area positively impact blood flow velocity?

  • It decreases the demand for oxygen in tissues.
  • It increases the pressure inside the vessels.
  • It reduces friction between blood and vessel walls.
  • It allows for more efficient exchange of substances at the capillary level. (correct)

    • What are the 3 ways substances are typically moved out of or into a capillary?

    <p>Diffusion, osmosis, active transport</p> Signup and view all the answers

    Which of the following roles does the lymphatic system play in regulating extracellular fluid volume?

    <p>Transporting excess fluid back to the bloodstream</p> Signup and view all the answers

    What is the main function of capillaries in the human body?

    <p>To facilitate gas exchange</p> Signup and view all the answers

    Which vessel type is characterized by the presence of a high proportion of smooth muscle and is densely innervated by sympathetic nerves?

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

    Why do capillaries have a slow flow rate?

    <p>To maintain low capillary pressure</p> Signup and view all the answers

    What is the primary function of metarterioles in the microcirculation system?

    <p>To act as arterio-venous shunts</p> Signup and view all the answers

    How does increasing the number of open capillaries impact exchange within the capillaries?

    <p>It increases the average diffusion distance for exchange</p> Signup and view all the answers

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