1E7936B357694B468B9C70137977E93B

1E7936B357694B468B9C70137977E93B - Chapter 21 Blood Vessels...

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Unformatted text preview: Chapter 21 Blood Vessels Direction of Flow Heart to aorta to arteries to arterioles to capillaries. Capillaries to venules to veins to vena cava to heart. Arteries Veins Capillaries form Microcirculation Microscopic vessels that connect arterioles to venules Found near every cell in the body but more extensive in highly active tissue (muscles, liver, kidneys & brain) entire capillary bed fills with blood when tissue is active lacking in epithelia, cornea and lens of eye & cartilage Function is exchange of nutrients & wastes between blood and tissue fluid Structure is single layer of simple squamous epithelium and its basement membrane Capillaries: 1. Continuous 2. Fenestrated 3. Sinusoid Venous valves Blood Distribution 12% pulmonary vessels 8 % = heart 15% = systemic arteries and arterioles 5% = capillaries 60% = systemic veins and venules Venous flow occurs by: 1. muscle contraction 2. respiratory pump 3. valve assistance 4. Ventricular relaxation Varicose Veins...
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1E7936B357694B468B9C70137977E93B - Chapter 21 Blood Vessels...

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