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doubleu doubleu
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8 years ago
Some sources say that water passes through the cell membrane via osmosis, and therefore don't require a transport protein. Other sources say that water moving into the cell is an example of facilitated transport, requiring aquaporins - water channels. What is the correct answer? Can water molecules easily pass the plasma membrane given their hydrophilic nature or do they always require an aquaporin?
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8 years ago
The cell‐membrane osmotic water permeability varies from cell to cell, depending on the composition of the lipid bilayer and the presence or absence of water pores. The two main pathways for plasma‐membrane water transport are the lipid bilayer and water‐selective pores (aquaporins). Aquaporins are a large family of water pores; some isoforms are water‐selective whereas others are permeable to small solutes.
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