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GCSE Biology · key term
The fluid surrounding body cells, through which substances are exchanged between the blood and cells.
Used by OCR
Specification B3.3f · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Osmotic changesBody cells are surrounded by tissue fluid, which contains water and dissolved substances. The fluid inside a cell also contains dissolved substances. If the two fluids differ in concentration, water can move across the cell membrane by osmosis.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Fluid surrounding body cells, through which substances are exchanged between the cells and the blood.
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Body cells are surrounded by tissue fluid, and blood cells are surrounded by blood plasma. These fluids contain water and dissolved substances. Their concentration matters because water can cross a cell's partially permeable membrane.