Diffusion Is The Net Movement Essay

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NAME: Partrice Davis (Isata Sheriff, Marianne Fafana, Binta Bojang) TITLE: Dye Diffusion INTRODUCTION Diffusion is the net movement in which molecules of a substance move from a various area of high concentration to more substances of lower concentration. Properties of diffusion is the speed of diffusion is influenced by the size of molecule and temperature. The rate of diffusion will depend on the ability of the diffusing molecule to dissolve in the lipid bilayer of the membrane. The rate of diffusion across a membrane is directly proportional to the surface area of the membrane. Diffusion is often referred to as the net motion of particles from areas of high concentration to areas of low concentration. The solute is a substance that can be dissolved in a mixture or solution usually in smaller amounts. Factors that would affect the rate consist of the size of the gradient, molecule size, electric charge, lipid solubility, temperature, and the presence of membrane channel proteins. Substances involved in diffusion include gas, small organic ions, and molecules, and lipid soluble materials. Simple diffusion is the unsupported transport across a plasma membrane of the lipid soluble. Certain particles like alcohol, fatty acids, and steroids are able to enter cells easily because they can diffuse through the lipid portion of the membrane. Lipid soluble drugs such as oxygen, carbon dioxide, and water may be able to enter and leave the cells by diffusing through the

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