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Active Transport Key WordsDiffusion – the spreading of something more widelyCell Membrane – the semipermeable membrane surrounding the cytoplasm of a cell.Osmosis – a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.Membrane – a pliable sheet-like structure acting as a boundary, lining, or partition in an organism.Concentration – the relative amount of a particular substance contained within a solution or mixture or in a particular volume of spaceActive Transport – the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.Respiration – a process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.Concentration Gradient –  the gradual difference in concentration of a dissolved substance in a solution between a region of high density and one of lower density.Gas Exchange – the transfer of gases between an organism and its environment, e.g. the process by which oxygen enters the body and carbon dioxide is expelled from it via the lungsSurface Area The total area of the surface of a three-dimensional object. Villi- any of numerous minute elongated projections set closely together on a surface, in particular.Glucose – a simple sugar which is an important energy source in living organisms and is a component of many carbohydrates.Dilute – a simple sugar which is an important energy source in living organisms and is a component of many carbohydrates.Ion – an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.Energy – the property of matter and radiation which is manifest as a capacity to perform work (such as causing motion or the interaction of molecules).

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