Lab 4 - Biology 301 Fall 2008 Chan Huynh Section 0012...

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Biology 301 Chan Huynh Fall 2008 Section 0012 Lab 4 Data Discussion Introduction 1. Osmosis is the diffusion of water through a selectively permeable membrane. Tonicity is the comparison of the osmotic pressure of the extracellular solution to the pressure inside a cell. Isotonicity occurs when the osmotic pressure of the intracellular and extracellular fluids are the same. Hypertonicity occurs when there is a higher concentration of solutes outside of the cell. As a result, water will diffuse from inside the cell into the surrounding fluids. The cell’s plasma membrane will shrink and shrivel and pull away from cell wall also known as plasmolysis. When this phenomenon occurs in red blood cells, it is referred to as crenation. The opposite situation, where the concentration inside the cell is greater than the concentration of the fluids surrounding the cell, is called hypotonicity. When this occurs, the cells swell; and if the swelling is great enough, the cell bursts open or lyses – also called hemolysis when dealing with red blood cells. The purpose of this experiment is to show how environmental conditions affect us and our cells as well as the properties of biological membranes.
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Lab 4 - Biology 301 Fall 2008 Chan Huynh Section 0012...

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