BRAINCAKEReturn of Tissue Fluid to Blood
The loss of tissue fluid from the capillaries reduces the hydrostatic pressure inside them. When blood reaches the venous end it’s hydrostatic pressure is lower than the tissue fluid outside it. Therefore tissue fluid is forced back into the capillaries by the higher hydrostatic pressure outside them. Water enters the capillaries from the tissue via osmosis as it has a lower water potential than the tissue fluid.
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Key terms in this lesson
- osmosis
- The net movement of water molecules from a region of higher water potential to a region of lower water potential through a selectively permeable membrane.
- water potential
- The pressure created by water molecules, a measure of the tendency of water to move out of a solution; pure water has a water potential of zero and solutes make it more negative.
- tissue fluid
- The fluid, formed by the filtration of blood plasma under hydrostatic pressure, that surrounds cells and supplies them with substances.
More in Mass Transport in Animals
- Pressure and Volume Changes
- Cardiac Output
- Blood Vessels
- Arteries
- Arterioles
- Veins and Venules
- Capillaries
- Tissue Fluid
All 27 lessons in Mass Transport in Animals · All AQA AS-level Biology topics