Question: where does osmosis take place in the human body

title: Osmosis
text: Osmosis is a vital process in biological systems , as biological membranes are semipermeable . In general , these membranes are impermeable to large and polar molecules , such as ions , proteins , and polysaccharides , while being permeable to non-polar or hydrophobic molecules like lipids as well as to small molecules like oxygen , carbon dioxide , nitrogen , and nitric oxide . Permeability depends on solubility , charge , or chemistry , as well as solute size . Water molecules travel through the plasma membrane , tonoplast membrane ( vacuole ) or protoplast by diffusing across the phospholipid bilayer via aquaporins ( small transmembrane proteins similar to those responsible for facilitated diffusion and ion channels ) . Osmosis provides the primary means by which water is transported into and out of cells . The turgor pressure of a cell is largely maintained by osmosis across the cell membrane between the cell interior and its relatively hypotonic environment .