Chapter 20, Problem 1TYR

Blood often flows into a capillary bed from

1. a. the distributing arteries.
2. b. the conducting arteries.
3. c. a metarteriole.
4. d. a thoroughfare channel.
5. e. the venules.

Summary Introduction

Introduction:

Arteries are blood vessels which bring oxygenated blood from the heart to other parts of the body. They are strong, resilient, and muscular tissues, when compared to veins. They are able to withstand the pressure of blood ejected in them.

Answer to Problem 1TYR

Correct answer:

Capillary beds are structured into web-like networks. These capillary beds are supplied by a metarteriole. Therefore, option c is correct.

Explanation of Solution

Justify reasons for the correct statement:

About 10 to 100 capillaries form a capillary bed; the blood is supplied to these capillaries by metarteriole.

Option (c) is given as, “metarteriole”.

Metarterioles are short blood vessels which link capillaries. These capillaries bypass the blood through venules.

Hence, option (c) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as, “the distributing arteries”.

The distributing arteries are capable of distributing blood to specific organs. Hence, it a wrong answer.

Option (b) is given as, “the conducting arteries”.

The conducting arteries are the large arteries, which include the aorta, pulmonary artery, and common iliac arteries. Hence, it a wrong answer

Option (d) is given as, “a thoroughfare channel”.

The distal ends of capillaries are the thoroughfare channels which lead to venules. Hence, it is a wrong answer.

Option (e) is given as, “the venules”.

The venules are the smallest of the veins. They receive blood from the capillaries either directly or by the distal ends of thoroughfare channels.  Hence, it is a wrong answer.

Hence, options (a), (b), (d), and (e) are incorrect.

Conclusion

Blood often flows into a capillary bed from a metarteriole.