Introduction
The cell membrane encloses the cell contents and regulates what gets in and out of the cell. This property of a cell is referred to as selective permeability and helps in maintaining life processes (Beckett 22). The property enables physiological process such as diffusion and osmosis to proceed. Diffusion is the movement of particles from a region of high concentration to a region of low concentration (Roberts and Mitchelmore 38). In a cell membrane, the molecules will diffuse from the side where the molecules are more to a region where they are less. Because of selective permeability, only molecules ...