Blood_Vessels - CIRCULATORY BLOOD SYSTEM 3 BLOOD VESSELS...

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BLOOD CIRCULATORY SYSTEM 3
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BLOOD VESSELS Arteries - conduct blood away from the heart Arterioles - little arteries Capillaries - concerned with exchange between blood and tissues Venules - little veins Veins - conduct blood to the heart
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1. Heart arteries arterioles capillaries venules veins heart 2. Through a portal system- blood flows through two consecutive capillary networks before entering the heart 3. Through arteriovenous shunt - artery flows directly into vein 4. Through an anastomosis (point where two blood vessels merge) CIRCULATORY ROUTES
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PORTAL SYSTEMS Hypothalamo-hypophyseal portal system between hypothalamus & anterior pituitary Renal portal system in kidneys Hepatic portal system between intestines and liver
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COMPONENTS OF VESSEL WALLS Tunica externa - outermost layer -loose connective tissue Tunica media - middle layer - smooth muscle, collagen, some elastic Tunica intima (interna) - innermost layer of simple squamous endothelium on a basement membrane and a layer of fibrous tissue
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REGULATION OF BLOOD PRESSURE AND FLOW 1. Local control 2. Neural control 3. Hormonal control
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Blood_Vessels - CIRCULATORY BLOOD SYSTEM 3 BLOOD VESSELS...

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