The Cardiovascular System: Blood Vessels and Circulation Chapter 20 Quiz

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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?

Regulate blood flow into capillary beds Signup and view all the answers

How is systolic blood pressure defined?

Pressure during ventricular contraction Signup and view all the answers

What is the purpose of measuring pulse pressure?

Assess the expansion of the artery due to ejected blood Signup and view all the answers

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

Decreases resistance, increases flow, and increases pressure Signup and view all the answers

What factor primarily determines the viscosity of blood?

Blood volume Signup and view all the answers

What does Mean Arterial Pressure (MAP) represent?

The average arterial pressure during a cardiac cycle Signup and view all the answers

Why are veins considered as blood reservoirs?

Because they have thin walls with large lumens and contain venous reserve Signup and view all the answers

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

To put pressure on veins to force blood back toward the heart Signup and view all the answers

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

Glucose Signup and view all the answers

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

To pick up extra fluid and eventually dump it into the subclavian vein Signup and view all the answers

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

To push fluid out of capillaries and into tissues Signup and view all the answers

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

Antidiuretic Hormone (ADH) Signup and view all the answers

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

To regulate blood pressure by producing vasoconstrictors Signup and view all the answers

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

Atrial Natriuretic Hormone Signup and view all the answers