Lecture 9 - Unit #5 Unit Circulatory System Blood Vessels...

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Unit #5 Unit #5 Circulatory System Circulatory System Blood Vessels Intro & Blood Vessels Intro & Vessels of Head and Neck Vessels of Head and Neck
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Blood Vessels - Intro Blood Vessels - Intro Blood vessels are the network of tubes that is used to carry blood throughout the body There are three types of: 1. Arteries Carries blood away from the heart Branch/diverge into smaller arteries and then arterioles 2. Veins Carries blood to the heart Merge/converge from small venules into larger veins 3. Capillaries Smallest blood vessels at the tissue level Fig. 19.1
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Blood Vessel Wall Structure Blood Vessel Wall Structure Hollow structure made up of a Lumen central blood-filled space Walls made of three layers Tunica intima (interna) contains the endothelium (a simple squamous epithelium) Tunica media circularly arranged smooth muscle and colagen and elastin fibrils Thicker in arteries than in veins Tunica externa layer of connective tissue (collagen and elastic fibers) that run longitudinally
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Tunica media (smooth muscle and elastic fibers) Tunica externa (collagen fibers) Artery Vein Lumen Lumen Internal elastic membrane External elastic membrane Valve Endothelial cells Basement membrane Capillary network Capillary Tunica intima Subendothelial layer Endothelium Fig. 20.1
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Arteries Arteries Carry blood away from the heart Elastic (conducting) arteries largest arteries near the heart Aorta and its branches Muscular (distributing) arteries distal to elastic arteries to supply organ groups, organs or their parts Arterioles are small arteries Table 20.1
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Capillaries Capillaries Body tissues are supplied by capillary beds a network of the smallest vessels
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This note was uploaded on 09/28/2011 for the course BIOL 301 taught by Professor Pickard during the Spring '09 term at Waterloo.

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Lecture 9 - Unit #5 Unit Circulatory System Blood Vessels...

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