Diffusion Of The Plasma Membrane

1373 Words Feb 15th, 2016 6 Pages
Introduction
Diffusion is one of two passive process membrane transports that moves molecules from a region of their higher concentration to a region of their lower concentration and has a driving force of kinetic energy. Simple diffusion, which is what this experiment is about, occurs without the assistance of membrane proteins along the concentration gradient not using any energy from the cell itself—this is where the kinetic energy come into play. Instead, the energy is coming from the molecules constant motion. Once the solutes are dispersed evenly through the solution, equilibrium will occur and the movement will stop (PhysioEx9.1). The plasma membrane in a cell is the physical barrier and is in charge of determining what goes in and out of the cell. If the cell is small enough, it will pass through the pores of the membrane and is usually aided by the concentration gradient—this is commonly known as a selective permeable membrane—meaning that it is going to allow some molecules to pass through the membrane but not necessarily other molecules.
Simple diffusion and osmosis are both selectively permeable membranes, the only difference between the two is that simple diffusion diffuses solute particles dissolved in water through a selectively permeable membrane, and osmosis is the diffusion of water through a differentially permeable membrane. In this experiment, water and four different types of solutes will be moved through selectively permeable membranes, each membrane…
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