Cells – Flashcards
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Active Transport
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Transport of substances through a membrane which requires energy. Molecules move against the concentration gradient from an area of low concentration to an area of higher concentration
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Endocytosis
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A type of active transport which large molecules are engulfed and taken into the cell
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Exocytosis
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A type of active transport which large molecules are secreted out of the cell
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Passive transport
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Transport of substances through a membrane which requires NO energy. Molecules move with the concentration gradient from an area of higher concentration to an area of lower concentration
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Osmosis
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A type of passive transport which molecules of water move in and out of a membrane with a concentration gradient
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Diffusion
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A type of passive transport which small molecules move in and out of a membrane with a concentration gradient
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Facilitated diffusion
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A type of passive transport which large molecules move in and out of a membrane through a protein
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Lipid bilayer
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Membrane structure of cells and organelles which consists of two layers of fats (heads facing out and tails facing in)
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Selective Permeability
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A property of biological membranes that allows some substances to cross more easily than others.
