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10 Cards in this Set
- Front
- Back
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selectively permneable
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some substances can pass through the membrane while otheres cannot
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cells are like....
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...castles because they protect their contents from the world outside.
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what do cells let in?
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they let in food molecules and oxygen
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the three methods of moving into and out of the cell are...
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...diffusion, osomosis and active transport.
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what does diffusion do?
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difusion is the main method by which small molecules jmove across the cell membrane
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before diffusion
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there is a higher concentration of oxygen molecules outside the cell than inside the cell
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osmosis
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the diffusion of water molecules through a selectively permeable membrane
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effect of Osmosis
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bathed in a solution in which the concentratioin of water is the same as it is inside the cell
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Passive transport
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material pass through the cell membrane without requiring the cells energy
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active transport
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active transport requires the cells energy. transport proteins move materials across the cell membrane
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