Osmosis and Plasmolysis

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Title: Osmosis and Plasmolysis
Introduction:
Osmosis is the diffusion of water through a semipermeable or selectively permeable membrane. In this process, water is also diffusing down a concentration gradient, that is, it moves from an area of higher concentration of water to an area of lower concentration of water. Osmosis is critical to survival of a cell, because cells may get destroyed if water concentration of inner and outer part of cell membrane is thrown out of balance.
The term tonicity describes the ability of a solution to cause a cell to gain or lose water. When a cell that lacks a cell wall is immersed in a solution that is isotonic, the cell’s volume remains constant, because the cell gains water at the same rate that it loses it. When this cell is in a hypotonic solution (lower solute concentration), the cell gains water, swells, and may burst and die(lyse), as for when it is in a hypertonic solution (higher solute concentration), the cell will shrivel and may die from water loss.

참고 자료

R to eece, Urry, Cain, Wasserman, Minorsky, Jackson(2012), Campbell Biology 9th Edition, p. 768-771, 바이오사이언스 출판