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Where is tissue fluid used?
The cells of the body are bathed in it.
It is essential for the efficient exchange of materials between the blood and the cells.
Where is tissue fluid formed?
It is formed at the arteriole end of the capillaries
The formation and reabsorption of tissue fluid
At the arteriole end, the hydrostatic pressure is high, due to the pressure from the heart beat, the elastic recoil of the arteries, and the volume of fluid.
The plasma also has an osmotic pressure, due to the soluble proteins in the plasma. There is a difference in the pressure as the plasma flows through the capillary network.
At the arteriole end, the hydrostatic pressure forcing fluid out is higher than the osmotic pressure drawing it in.
The hydrostatic pressure drops, and the osmotic pressure increases as the proteins become more concentrated. Therefore drawing fluid in at the end of the capillary network.
Tissue fluid leaving the capillary contains glucose and ions needed by the cells. Tissue fluid entering the capillary contains the metabolic waste products from the cells.
Excess tissue fluid drains into lymph capillaries, which eventually returns the fluid to the veins.
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