Explanation Justification for the correct answer: Option (d) is given that flow of blood in blood capillaries is under the control of metarteriole. Metarteriole is also known as precapillary sphincter, a short vessel linking arterioles and capillaries, which guards the entryway to the capillaries and carries blood away from the heart. Hence, option (d) is correct. Justification for incorrect answers: Option (a) is given that flow of blood in the capillaries is under the control of arterial anastomosis. A few arteries, also known as collaterals join together and form interconnections, which are known as arterial anastomosis. These structures ensure blood supply to the tissues because even if one is blocked, the other vessel will carry the blood to the capillary bed. So, it is an incorrect option...

Blood capillaries are small blood vessels that have thin walls and form networks known as capillary beds. The endothelial cells form only one layer in the capillaries. They serve as a site for the exchange of many substances such as nutrients, gases, and waste substances. The blood flow through the capillaries is also highly regulated. For instance, the metarteriole regulates the blood flow in the capillary and the thoroughfare channels provide communication between venules and arterioles.

HUMAN ANATOMY-ACCESS

9th Edition

ISBN: 9780134562773

Author: Martini

Publisher: PEARSON

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Question

Chapter 22, Problem 16RFT

Summary Introduction

Introduction:

Blood capillaries are small blood vessels that have thin walls and form networks known as capillary beds. The endothelial cells form only one layer in the capillaries. They serve as a site for the exchange of many substances such as nutrients, gases, and waste substances. The blood flow through the capillaries is also highly regulated. For instance, the metarteriole regulates the blood flow in the capillary and the thoroughfare channels provide communication between venules and arterioles.

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Chapter 22, Problem 15RFT

Chapter 22, Problem 1RC

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Solution Summary: The author explains that the flow of blood in blood capillaries is under the control of the metarteriole and the thoroughfare channels.

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