Topic 10 The Cardiovascular System- Blood vessels

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Topic 10 The Cardiovascular System- Blood vessels Essentials of Human Anatomy & Physiology Seventh Edition Elaine N. Marieb Topic 10 The Cardiovascular System- Blood vessels Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Blood Vessels: The Vascular System Taking blood to the tissues and back Arteries Arterioles Capillaries Venules Veins Slide 11.23 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

The Vascular System Figure 11.8b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Blood Vessels: Anatomy Three layers (tunics) Tunic intima Endothelium Tunic media Smooth muscle Controlled by sympathetic nervous system Tunic externa Mostly fibrous connective tissue Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Differences between blood vessels Walls of arteries are the thickest Lumens of veins are larger Skeletal muscle “milks” blood in veins toward the heart Walls of capillaries are only one cell layer thick to allow for exchanges between blood and tissue Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Movement of blood through vessels Most arterial blood is pumped by the heart Veins use the milking action of muscles to help move blood Figure 11.9 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings