Explanation The task of transportation of the fluid and dissolved substances in the body is carried out by a variety of vessels. The vessels are in general comprised of three layers. The abundance of the three types of layers may vary according to the type of vessel. The three layers also possess several characteristic features. The appropriate vascular tunics for the given statements are listed below: 1. Tunica intima: This layer is the interior of most layers of the blood vessel. The lumen of blood vessels is lined by simple squamous epithelium and this layer contains the endothelium. The endothelial cells minimize the friction between the lumen and the flowing blood. 2. Tunica externa: This is the external most layer of the blood vessels. The vessels receive nourishment from the vasa vasorum, which is mostly associated with the external most layer of the blood vessels. Thus, tunica externa is the layer with the largest vasa vasorum. 3. Tunica externa: Thick tunica externa in the veins as compared to the tunica media differentiates the vein from the arteries...

9th Edition

ISBN: 9780135168059

Author: Marieb, Elaine Nicpon, Brady, Patricia, Mallatt, Jon

Publisher: Pearson Education, Inc.,

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Question

Chapter 20, Problem 4RQ

Summary Introduction

To review:

The appropriate vascular tunic for the given statements.

Introduction:

All the blood vessels, namely the arteries, capillaries, and veins are comprised of three layers that are termed as tunics. These tunics are tunica intima, tunica media, and tunica externa and they are named according to their location. The internal most layer of these vessels is termed as the intima, middle as media, and external as externa.

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Chapter 20, Problem 3RQ

Chapter 20, Problem 5RQ

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Fill in the blanks with the name of the appropriate vascular tunic (intima, media, or externa).__(1) forms the valves of veins__(2) the thickest tunic in veins__(3) the tunic with the largest vasa vasorum__(4) the outer tunic; is mostly connective tissue__(5) contains endothelium__(6) is mostly smooth muscle

Select the best answer or answers from the choices given: Which statement does not accurately describe veins? (a) Have less elastic tissue and smooth muscle than arteries, (b) contain more fibrous tissue than arteries, (c) most veins in the extremities have valves, (d) always carry deoxygenated blood.

Fill in the blank: The smallest blood vessels are called _______________________.

Chapter 20 Solutions

Human Anatomy

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Solution Summary: The author enumerates the three types of vascular tunics for the arteries, capillaries, and veins.

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