B3 diffusion and active transport

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cells need to transport substances in and out,

e.g. oxygen can diffuse in from an area of low concentration to an area of high concentration, carbon dioxide can diffuse out from an area of high concentraion to an area of low concentration.

water by osmosis, moves in and out

glucose, molecule required for respiration ususally there is a higher concentration of this inside the cell, glucose are stopped from diffusing back out of the cell and to keep glucoses moving into the cell active transport is required.

active transport requires energy from respiration because it is working against a…


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