Distance: -The ____ the distance molecules have to travel the ____ transport will occur. This is why blood capillaries and alveoli have walls which are only ____ cell thick, ensure the rate of diffusion across them is as ____ as possible Temperature -The ____ the temperature, the ____ molecules move as they have more ____ This results in more ____ against the cell membrane and therefore a faster rate of movement across them Concentration Gradient -The ____ the difference in concentration on either side of the membrane, the ____ movement across it will occur This is because on the side with the higher concentration, more ____ collisions against the membrane will occur Surface area to volume ratio -The ____ a cell or structure is, the ____ its surface area to volume ratio is, ____ down the rate at which substances can move across its surface. -Many cells which are adapted for ____ have ____ surface area in some way - eg root hair cells in plants (which absorb water and mineral ions) and cells lining the ileum in animals (which absorb the products of digestion)

Factors Affecting Diffusion

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