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Capillaries Veins

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Capillaries Veins

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    1. 23 Feb. 2010 Capillaries-&-Veins.ppt 1 Capillaries & Veins

    2. 23 Feb. 2010 Capillaries-&-Veins.ppt 2 Capillaries Capillaries Tiny, thin-walled vessels penetrating nearly all tissues Enormous area for exchange between blood and tissues.

    3. 23 Feb. 2010 Capillaries-&-Veins.ppt 3 Capillaries Mechanisms of exchange Filtration Leakage by hydrostatic pressure Recovery of fluid at venous end Balance of fluid recovered by lymphatic capillaries.

    4. 23 Feb. 2010 Capillaries-&-Veins.ppt 4 Capillaries Mechanisms of exchange Diffusion O2 Glucose Amino acids CO2 Ammonia, NH3 Urea Hormones

    5. 23 Feb. 2010 Capillaries-&-Veins.ppt 5 Capillaries Mechanisms of exchange Osmosis Loss/gain of water depending on osmotic pressure

    6. 23 Feb. 2010 Capillaries-&-Veins.ppt 6 Capillaries Mechanisms of exchange Vesicular transport Endothelial cells take large proteins from blood into vesicles, Released outside capillary Albumins, antibodies.

    7. 23 Feb. 2010 Capillaries-&-Veins.ppt 7 Capillaries Regulation of capillary circulation Precapillary sphincters open or close individual capillaries Neural (ANS) control Hormonal control Local conditions

    8. 23 Feb. 2010 Capillaries-&-Veins.ppt 8 Capillaries Long-term changes Angiogenesis—growth of new capillaries into growing tissues Wound healing Tumors ?

    9. 23 Feb. 2010 Capillaries-&-Veins.ppt 9 Veins Veins normally hold ~65% of blood volume Blood reservoir Venous flow Little pressure to drive flow Valves direct flow, prevent backflow

    10. 23 Feb. 2010 Capillaries-&-Veins.ppt 10 Veins Venous “pumps” Respiratory pump Muscular pump

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