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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 Æ Through the lungs Æ to the entrance of the left atrium • Systemic Circuit- oxygenation of tissue • From the aortic semilunar valve Æ through the body Æ 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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