Chapter 33 Anatomy of Blood

Chapter 33 Anatomy - Chapter 33 Anatomy of blood vessels The wall of the blood vessels Three distinct layers l Tunica intima Lines the lumen Simple

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Chapter 33 Anatomy of blood vessels
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The wall of the blood vessels ¢ Three distinct layers l Tunica intima Lines the lumen Simple squamous epithelium endothelium and endocardium l Tunica media Smooth muscle, collagen and elastic fibers Regulates the diameter of the blood vessels
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The wall of the blood vessels l Tunica externa or adventitia Areolar or fibrous connective tissue Supports the vessel Protects the vessel
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The wall of the blood vessels
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Arteries ¢ Blood vessels that conduct blood away from the heart and toward tissues. In the pulmonary circulation, pulmonary arteries conduct deoxygenated blood to the lungs. In the systemic circulation, the aorta and its branches conduct oxygenated blood toward the systemic tissues
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Arteries ¢ Small arteries are called arterioles . Arterioles conduct blood into a network of even smaller vessels, or capillaries .
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Arteries ¢ Subject to pressure fluctuations ¢ Thick walls ¢ Contain more smooth muscle and elastic tissues ¢ Narrower lumen than veins
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Arteries ¢ Can be classified as: ¢ Elastic l Closer to the heart l Large arteries l More elastic fibers than smooth muscle
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Arteries ¢ Muscular l Farther from the heart l Smaller arteries l More smooth muscle than elastic fibers
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Veins ¢ Blood vessels that conduct blood toward the heart. In the pulmonary circulation, the pulmonary veins return oxygenated blood from the lungs. In the systemic circulation the vena cava returns deoxygenated blood from the rest of the systemic loop. Venules are small veins.
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This note was uploaded on 01/06/2012 for the course BIOL 2402 taught by Professor Elainefanin during the Spring '11 term at Collins.

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Chapter 33 Anatomy - Chapter 33 Anatomy of blood vessels The wall of the blood vessels Three distinct layers l Tunica intima Lines the lumen Simple

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