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Unformatted text preview: All other organs of the circulatory system exist only to serve the capillary beds. Capillaries in the human body:- surface area: 6000 sq. meters (12 soccer fields)- 60,000 miles long- mass - twice the size of the liver Venules - small vessels that conduct venous blood from capillaries to veins Veins - vessels that convev blood (@D the heart. In general, veins are of greater diameter, but thinner-walled than the arteries with which they travel. There are both superficial and deep veins Veins also have smooth muscle in their walls that allow them to change their diameter The venules and the veins constitute the low pressure part of the circulatory system. Valves -lfound in those veins which carry blood against ttre&lcepferaViU especially intheveinsofthelegs # Mechanisms involved in return of blood to the heart:rl...
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This note was uploaded on 12/29/2011 for the course KIN 142 taught by Professor Asmundson during the Fall '09 term at Simon Fraser.
- Fall '09