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Download Active Transport Small particles such as water, carbon dioxide and
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Transcript
Active Transport Small particles such as water, carbon dioxide and oxygen diffuse freely through the cell membrane yet there are other larger particles that the cell needs that cannot be obtained through diffusion. For example cells need glucose for energy. The glucose is present in low concentrations in your blood vessels. It is in high concentration inside your cells because your cells constantly use the glucose. Therefore the cell uses ENERGY to move glucose from your blood vessels into the cells. Since glucose is a large particle, a carrier protein is needed to move the glucose across the cell membrane. This process of moving molecules from an area of low concentration to an area of high concentration using a carrier protein is known as active transport because the cell uses ENERGY to move the molecules up the concentration gradient. 1 low concentration high concentration 2