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How can unicellular organisms living in water control the entry and exit of water from their cells and can they live in any environment?
Wiki User
∙ 7y ago
Water typically diffuses in and out of cells depending on the concentration of solutes (other gunk not water) in both the cell and the external environment. Osmosis (the diffusion of water), happens from where the solute concentration is lowest to where the solute concentration is highest (or more sensibly, water travels to dilute the solute; so imagine if a cell with a lot of gunk in it swims into pure water, water will start to move into the cell).
Cells can also actively transport water using ATP through membrane proteins called aquaporins. (More here)These proteins essentially pump water out and maintain a gradient between the cell and the external environment, such that water doesn't just diffuse in and try to reach equilibrium. This would be a way cells can live in other environments without either lysing or bursting.
Wiki User
∙ 7y ago
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