1431cv9 - • Blood-composed of specialized cells and...

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9 Venous Return • Venules- reduce cross section area – low pressure circulation – blood returning to heart • Venous return - facilitated by one way valves in veins preventing back flow – skeletal muscle pump – Active cool down
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Unformatted text preview: • Blood -composed of specialized cells and plasma(50-60% of volume) ( mainly water) • red blood cells - carry O 2 , CO 2 • white blood cells - immunity • platelets - blood clotting...
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