Ch22_Vessels

Ch22_Vessels - Cardiovascular system II Cardiovascular...

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Unformatted text preview: Cardiovascular system II Cardiovascular system II Arteries vs. Veins Vessels-pipes, carries blood throughout the body Arteries carry blood away from the ventricles of the heart Arteries carry O 2 rich blood except the pulmonary arteries Veins carry blood to the atria of the heart Veins carry deoxygenated blood except the pulmonary veins Circuits of the Vascular System Pulmonary Circuit- oxygenation of blood From the Pulmonary semilunar valve Through the lungs to the entrance of the left atrium Systemic Circuit- oxygenation of tissue From the aortic semilunar valve through the body to the entrance of the right atrium Tunics (Layers) of vessel Walls Tunica interna Deepest layer (contacts blood) Endothelial lining + basement membrane Arteries have elastic layer Tunica media Middle layer Layers of smooth muscle Arteries have elastic fibers Tunica Externa Superfical layer Connect tissue layers-attaches to each other and other organs Both have elastic and collagen fibers Fig 22.1 Arteries have a thicker tunica media Elastic Arteries Conducting arteries (move larger amount of blood) large diameter (2.5cm) walls proportionally not as thick (relative to diameter) Tunica media- few smooth muscle fibers high density of elastic fibers (for elastic recoil)...
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Ch22_Vessels - Cardiovascular system II Cardiovascular...

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