True: Substances may move into and out of cells across the cell membranes via diffusion., Diffusion = spreading out of the particles of any substance in solution, or particles of a gas, resulting in net movement from an area of higher conc to an area of lower conc., O2 and CO2 are moved in and out of cells by diffusion in gas exchange, Temperature affects the rate of diffusion, Surface area of the membrane affects the rate of diffusion, Difference in concentrations (conc. gradient) affects the rate of diffusion, Single-celled organisms have a relatively large surface area to volume ratio., A relatively large SA:V allows transport of molecules into and out of the cell to meet the needs of the organism., Effectiveness of an exchange surface is increased by having a large surface area, Effectiveness of an exchange surface is increased by having a membrane that is thin, to provide a short diffusion path, Effectiveness of an exchange surface is increased by having an efficient blood supply, Effectiveness of an exchange surface for gaseous exchange is increased by being ventilated., False: Diffusion = spreading out of the particles of any substance in solution, or particles of a gas, resulting in a net movement from an area of lower conc to an area of higher conc., O2 and CO2 are moved in and out of cells by active transport in gas exchange, O2 and CO2 are moved in and out of cells by osmosis in gas exchange, A single-celled organism has a relatively small surface area to volume ratio., Effectiveness of an exchange surface is increased by having a small surface area, Effectiveness of an exchange surface is increased by having a membrane that is thick, to provide a long diffusion path,

Transport in cells - diffusion focus

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