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Chapter 21: Arteries, Capillaries, and Veins

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Chapter 21: Arteries, Capillaries, and Veins

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Questions and Answers

What is the primary function of venules in the circulatory system?

Regulate blood flow and pressure

Conduct blood from heart to muscular arteries

Deliver blood to capillaries

Drain blood from capillaries into veins (correct)

What type of artery is characterized by a larger diameter and more elastic fibers?

Elastic artery (correct)

Arteriole

Muscular artery

Venule

What is the term for the tightening of blood vessels, which increases blood pressure?

Vascular resistance

Vasodilation

Blood flow

Vasoconstriction (correct)

What type of capillary is characterized by incomplete pores and a basement membrane, allowing for the transport of molecules and plasma proteins?

Sinusoid Capillary (A) Signup and view all the answers

What is the equation for cardiac output (CO)?

CO = heart rate (HR) × stroke volume (SV) (C) Signup and view all the answers

What is the consequence of left ventricular failure on the organs?

Reduced oxygen to organs (A) Signup and view all the answers

What is the primary function of arteries in the body?

To carry blood away from the heart to the tissues (D) Signup and view all the answers

What is the characteristic of capillary walls that allows for exchange of nutrients and waste?

They are thin and permeable (C) Signup and view all the answers

Which layer of blood vessels contains smooth muscle and elastic fibers?

Tunica Media (C) Signup and view all the answers

What is the purpose of valves in veins?

To allow proper blood flow (C) Signup and view all the answers

Why are the layers of blood vessels thicker in arteries?

To withstand pressure (D) Signup and view all the answers

What is the lumen of a blood vessel?

The cavity space (B) Signup and view all the answers