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Biology

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Cellular Transport
Nancy Tucker
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Nancy Tucker
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Homeostasis Maintaining a balance in an organism’s environment; keeping stable conditions.
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The Cell membrane helps maintain homeostasis and it is a PHOSPHOLIPID BILAYER
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The two major components of the cell membrane are lipids and proteins
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Endocytosis Particles move INTO the cell
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Exocytosis This causes the cell to expand (swell) WATER moves into the cell Example: Distilled water
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Hypertonic Solution Causes a cell to shrink (shrivel) WATER leaves the cell Example: Salt water
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Isotonic Solution The cell stays the same
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Passive Transport NO energy is needed
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Simple Transport The movement of molecules from areas of high concentration to areas of low concentration
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Facilitated Diffusion Molecules move from a high concentration to a low concentration, but with help of a transport (carrier) protein
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Osmosis Diffusion of water
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Active Transport Energy is required to move molecules from low to high. It uses transport proteins (sometimes called pumps) Examples: sodium (NA) Potassium (K)
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