Lab Report - Katherine McLean Biology 301; Fall 2009...

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Katherine McLean Biology 301; Fall 2009 September 30, 2009 Lab 4: Data Discussion 1. Osmosis is the diffusion of a solvent through a selective membrane. A specific example is the movement of water from areas of high water potential (low solute concentration) to areas of low water potential (high solute concentration), which often equalizes the concentrations on each side of the membrane. Isotonicity is achieved when the osmolarity is the same inside and outside of the cell, therefore there is no net osmosis. Hypertonicity is a condition when cellular fluids contain a higher concentration of osmotically active particles than the blood plasma, so water diffuses out and the cell shrinks because there is a net diffusion of water out of the cell. A biological example of cells shrinking in hypertonic solutions is crenation, red blood cells will actually shrivel up because the water moves out of the rigid cell wall. In plant cells, the plasma membrane actually pulls away from the cell wall in a process called plasmolysis. Hypotonicity is the opposite of hypertonicity, and hypotonicity occurs when cellular fluids contain a lower concentration of osmotically active particles than the blood plasma, so water diffuses into
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This note was uploaded on 04/20/2011 for the course BIO 302 taught by Professor De during the Spring '10 term at Purdue University-West Lafayette.

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Lab Report - Katherine McLean Biology 301; Fall 2009...

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