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Cell environments
Uni of Notts, Genes, Molecules and Cells, first year
| Term | Definition |
|---|---|
| How water is ratiod in the body | Intracellular - 40% Interstitial - 15% Blood plasma - 5% |
| How phospholipid bilayers form | In aqueous solutions the hydrophobic tails face in towards other tails (& heads face the solution) since it's the only thing that doesn't repel them which forms a regular surface |
| How liposomes form | Due to the forces of attraction & repulsion in water, the layers join into discreet spheres around pockets of fluid, this is believed to be where cells originate from |
| Pinocytosis (cell drinking) | Engulfing extracellular fluids & lipids by invaginating (budding into vesicles) the cell membrane. Similar to endocytosis but for smaller, liquid, substances |
| Difference in composition of body fluids (intracellular, interstitial, plasma) | Interstitial fluid and blood plasma have similar concentrations of solutes however intracellular fluid has around 10x less sodium & chloride but 30x higher potassium and significantly higher protein |
| How different cellular environments have such different concentrations of solutes | Selective ability of membranes to selectively transport solutes making each environment separate & able to carry out its specific function |
| How the speed of water molecules affects its solvent ability | Water molecules move at 2,500km/h at room temperature, this causes many collisions in a dense area which dissolves solutes quickly & allows osmosis to be efficient |
Created by:
Beech47
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