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    Can anyone tell me the difference between blood, tissue fluid, and lymph?

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    Well you have the oxygenated blood flowing through an artery, as it passes respiring tissue molecules diffuse out of the artery. Only molecules that are small enough to fit through the gaps can diffuse out, this forms the tissue fluid. The tissue fluid bathes the body cells and brings the nutrients/oxygen to the cells. The lymphatic system basically gets all the bits of the tissue fluid that you don't want (e.g. bacteria) and transports it to lymph nodes where there are large concentrations of lymphocytes that destroy the bacteria and then sends it back to the circulatory system.
 
 
 
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