BIOL130 Midterm: BIOL 130 – Week Six Notes SIMPL (Membranes)
1 Aug 2016
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Creates an imbalance in water concentration as well. The side with trapped solute will draw water across until the concentrations are roughly evil. Movement of water in situations like this is roughly osmosis: osmotic pressure = when you put pressure (ex. with a plunger) and release to see water movement. Turgor pressure = the pressure of cell contents against the cell wall in plant and bacterial cells. Osmoconformers: most marine organisms adjust their internal salt concentrations to match seawater. Osmoregulators: some single-celled eukaryotes have contractile vacuoles that periodically pump out water, terrestrial organisms carefully regulate the osmolarity of a fluid they circulate through their bodies such that it is iso-osmotic with their cytoplasm. Turgor: most plants are hyper-osmotic to their environment, water pulled into cell, presses membrane out to cell wall. We are probably more like osmoconformers but we work really hard to get that.
