how does it help in the formation of tissues
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Tissue fluid is formed in the capillaries due to the hydrostatic pressure from the pumping of the heart. It is composed of water molecules, fatty molecules, CO2 and lymph (drained of in the lymph system afterwards).Pressure causes, small molecules to be pushed out of the blood plasma through the capillaries (ultrafiltration) and to form interstitial fluid (tissue fluid) Note plasma proteins from the blood remain in the blood plasma since these are too large to pass through capillaries. Water is reabsorbed into the blood plasma by osmosis to maintain blood pressure.
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