17_Vessels - BLOOD VESSELS Chapter 23 Three Classes of...

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BLOOD VESSELS Chapter 23
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Three Classes of Vessels Arteries Transport blood away from the heart Carry oxygen-rich blood in the systemic circuit Carry oxygen-poor blood in the pulmonary circuit and umbilical arteries Anastomosis: Union of two blood vessels Ex. The two vertebral arteries fuse into the basilar artery Capillaries Location of gas and nutrient exchange between vessels and tissues Veins Transport blood towards the heart Carry oxygen-poor blood in the systemic circuit Carry oxygen-rich blood in the pulmonary circuit and umbilical vein
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Vessel Tunics Lumen Inner space of the vessel Tunica intima Innermost layer Simple squamous endothelium Tunica media Circularly arranged smooth muscle fibers Location of vasodilation and vasoconstriction Tunica externa Outermost layer Collagen and elastic fibers
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Comparison of Vessel Structures Arteries Thickest tunica media Capillaries Only tunica intima Allow rapid gas exchange Veins Thickest tunica externa Smaller tunica media than arteries Valves
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Heart Elastic Artery Muscular Artery Arteriole Capillary Venule Medium vein Large Vein Heart
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Elastic Arteries Largest arteries “Conducting arteries” Between heart and muscular arteries High elastin content allows arteries to stretch and dampen surges and reduce blood pressure resulting from contractions of heart Aorta and its major branches Brachiocephalic, common carotid, subclavian, common iliac arteries, etc.
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Aortic Branches
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