Kaplan Anatomy Coloring Book.pdf by unknow

Author:unknow
Language: eng
Format: epub
Tags: Kaplan Anatomy Coloring Book.pdf

Answer Key: a. Pulmonary semilunar valve, b. Aortic semilunar valve, c. Left atrioventricular valve, d. Right atrioventricular valve, e. Sinoatrial node, f. Atrioventricular bundle, g. Atrioventricular node, h. Bundle branches, i. Purkinje fibers

Chapter Eight Cardiovascular System

me&ical ^^^

VESSELS OVERVIEW

The blood vessels have different thickness due to the differences in pressure that occur in them or their function with respect to exchanging nutrients with the cells. Arteries have thick walls due to the higher pressure found in them. Just as high pressure hoses have thick walls so do arteries. The outer layer of the artery is the tunica externa (tunica adventitia). You should locate the tunica externa and color it in. The middle layer of the artery, the tunica media is the thickest layer and it is made of smooth muscle and elastic fibers. Color the tunica media red. The innermost layer of the artery is the tunica intima (tunica interna) and it has a special elastic layer called the lamina elastic interna. Color this layer. The area in the artery where the blood flows is called the lumen.

Veins are thinner walled than arteries and they do not have the same elastic fibers in the tunica media as arteries. Color the tunica media of the veins red and select the same colors as you did for the arteries for the tunica externa and the tunica interna. The tunica interna of veins is folded into valves that allow for a one-way flow of blood through veins.

Capillaries are different from both arteries and veins in that they are composed of only simple squamous epithelium (called endothelium). The thin nature of capillaries allows them to exchange nutrients, water, carbon dioxide and oxygen with the cells. Color in the endothelium of the capillary with the same color that you selected for the tunica interna.

Answer Key: a. Vein, b. Artery, c. Lumen, d. Tunica intima, e. Tunica media, f. Tunica externa, g. Lamina elastica interna, h. Lamina elastica externa, i. Smooth muscle, j. Venule, k. Endothelium, I, Arteriole, m. Capillary, n. Venous valve

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