Diffusion And Diffusion Of Diffusion

1065 Words Nov 27th, 2014 5 Pages
Introduction: All cells contain membranes that are selectively permeable, allowing certain molecules to pass into the membrane as well as block the transport of large molecules from entering. The membrane serves as a barrier to separate the cell and its ‘environment. Without the cell membrane, the substances necessary to the life of the cell would diffuse to the cell’s surroundings, causing toxic materials to enter into the cell. The diffusion of the solutes is limited by the semipermeable membrane. Diffusion is the movement of ions or molecules from an area of higher concentration to an area of lower concentration. Diffusion proceeds until the two concentrations are equal. For example, if a lump of sugar is dropped into a beaker of water, its molecules dissolve and diffuse. Diffusion results in an even distribution of sugar molecules throughout the water (Department of Life Sciences 2011). The diffusion of the molecules depends on the presence of a gradient of concentration. The concentration gradient affects the rate of diffusion. The greater the difference in concentration, the faster the diffusion. The closer the distribution of the material gets to equilibrium, the slower the rate of diffusion. Osmosis is the diffusion of water across a semi-permeable membrane. Both Osmosis and Diffusion are known as passive transports: they require no energy for the movement of molecules. The concentration of the solute will determine the flow of water. A hypotonic solution is when…

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