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...

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

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