The Cardiovascular System: Blood Vessels and Circulation Chapter 20 Quiz
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Questions and Answers

What is the role of vasa vasorum in blood vessels?

  • Act as a barrier to prevent substances from entering the vessel walls
  • Control blood pressure through vasoconstriction
  • Prevent backflow of blood in veins
  • Deliver nutrients and remove waste from the cells of large vessels (correct)

What is the purpose of valves in veins?

  • Ensure smooth blood flow in arteries
  • Promote vasoconstriction
  • Increase blood pressure
  • Prevent backflow of blood (correct)

Which type of capillary has pores and is permeable to larger molecules?

  • Sinusoid capillaries
  • Metarteriole capillaries
  • Fenestrated capillaries (correct)
  • Continuous capillaries

What is the function of precapillary sphincters?

<p>Regulate blood flow into capillary beds (B)</p> Signup and view all the answers

How is systolic blood pressure defined?

<p>Pressure during ventricular contraction (A)</p> Signup and view all the answers

What is the purpose of measuring pulse pressure?

<p>Assess the expansion of the artery due to ejected blood (A)</p> Signup and view all the answers

How does an increase in vessel radius affect blood flow and pressure?

<p>Decreases resistance, increases flow, and increases pressure (A)</p> Signup and view all the answers

What factor primarily determines the viscosity of blood?

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

What does Mean Arterial Pressure (MAP) represent?

<p>The average arterial pressure during a cardiac cycle (B)</p> Signup and view all the answers

Why are veins considered as blood reservoirs?

<p>Because they have thin walls with large lumens and contain venous reserve (B)</p> Signup and view all the answers

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

<p>To put pressure on veins to force blood back toward the heart (C)</p> Signup and view all the answers

Which of the following molecules can move through intercellular clefts in capillaries?

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

What is the function of the lymphatic system in the vascular system?

<p>To pick up extra fluid and eventually dump it into the subclavian vein (D)</p> Signup and view all the answers

What is the primary function of bulk flow in capillary exchange?

<p>To push fluid out of capillaries and into tissues (C)</p> Signup and view all the answers

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

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

What is the main role of Renin-Angiotensin-Aldosterone mechanism in the vascular system?

<p>To regulate blood pressure by producing vasoconstrictors (D)</p> Signup and view all the answers

Which of the following hormones suppresses renin, antidiuretic hormone (ADH), and aldosterone secretion?

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

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