Cardiovascular System: Blood Vessels Chapter 20.1 Quiz
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Questions and Answers

What is the function of vasa vasorum in the cardiovascular system?

  • Ensure one-way flow of blood in veins
  • Deliver nutrients and remove waste from the cells of large vessels (correct)
  • Control blood pressure in arteries
  • Transport blood away from the heart

Which blood vessels have valves to prevent backflow?

  • Veins (correct)
  • Capillaries
  • Venules
  • Arteries

In the cardiovascular system, what is the primary function of precapillary sphincters?

  • To constrict smooth muscle in arteries
  • To prevent blood backflow in veins
  • To regulate blood pressure in arterioles
  • To allow blood into a capillary bed or not (correct)

What is the function of a venule in the cardiovascular system?

<p>Receive blood from capillaries (C)</p> Signup and view all the answers

What is the primary function of arterioles in the cardiovascular system?

<p>Slow down blood flow to decrease blood pressure (D)</p> Signup and view all the answers

Which type of capillary allows plasma proteins and cells to pass through due to its structure?

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

What does the external elastic membrane separate in the cardiovascular system?

<p>Media from outer tunic in large arteries (B)</p> Signup and view all the answers

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

<p>Control blood flow into a capillary bed (C)</p> Signup and view all the answers

Which factor has a direct impact on blood pressure and flow resistance in the cardiovascular system?

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

What happens if mean arterial pressure (MAP) falls below 60 mm Hg for an extended period of time?

<p>Risk of ischemia and hypoxia (C)</p> Signup and view all the answers

What is the role of the skeletal muscle pump in the venous system?

<p>To contract leg muscles and increase pressure on veins (B)</p> Signup and view all the answers

How does vasoconstriction affect the flow in arteries?

<p>Increases pressure and resistance, but decreases flow (A)</p> Signup and view all the answers

What are the main substances that use transporters to move through capillary walls?

<p>Glucose, amino acids, Na+, K+, Ca++, and Cl- (C)</p> Signup and view all the answers

Which factor causes bulk flow to move fluid from capillaries into tissues?

<p>Filtration due to high pressure in capillaries (C)</p> Signup and view all the answers

How much fluid is reabsorbed back into the capillaries each day?

<p>24 L (D)</p> Signup and view all the answers

What hormone targets the kidneys to reabsorb water, increasing blood volume and pressure?

<p>Antidiuretic Hormone (ADH) (A)</p> Signup and view all the answers

How does the Renin-Angiotensin-Aldosterone Mechanism affect blood pressure?

<p>It produces Angiotensin 2 which is a powerful vasoconstrictor (D)</p> Signup and view all the answers

What type of shock involves an inability to deliver adequate oxygen for normal cellular metabolism?

<p><strong>Circulatory Shock</strong> (C)</p> Signup and view all the answers

Clinical Considerations: What can chronic high blood pressure (140/90 or above) lead to?

<p><strong>All of the above</strong> (D)</p> Signup and view all the answers

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