After reviewing the arteries and veins structure, discuss their functions, and then discuss the location, structure, and role of blood capillaries.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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After reviewing the arteries and veins structure, discuss their functions, and then discuss the location, structure, and role of blood capillaries.

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Arteries are blood vessels that carry oxygenated blood from the heart to the tissues (except the pulmonary artery). 

Veins are blood vessels that carry deoxygenated blood from tissues to the heart (except the pulmonary vein). 

Arteries are thicker than veins as their middle layer is thicker than the middle layer of veins. Both types of vessels have three layers in the wall. Some of the veins in the legs have valves. 

Arteries carry blood with high pressure and veins carry blood with lower pressure. 

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