B3 - Movement of Molecules In and Out of Cells 3.0 / 5 based on 2 ratings ? BiologyDiffusionOsmosisActive TransportGCSEAQA Created by: 11jc01Created on: 31-03-16 16:43 Osmosis The movement of water through a partially permeable membrane into a solution with low water concentration 1 of 11 Concentration gradient A change in the concentration of a substance from one region to another 2 of 11 Active transport The movement of substances against the concentration gradient; requires energy 3 of 11 Specialised Adapted from particulate purpose 4 of 11 Surface area The external area of the living thing 5 of 11 Villi Projections that stick out from the walls of the small intestine; each villus contains a network of blood capillaries for absorbing soluble food 6 of 11 Alveoli Air sacs in the lungs; oxygen diffuses out of them and carbon dioxide diffuses into them 7 of 11 Ventilation The process of breathing in and out 8 of 11 Stomata Openings /pores in leaves 9 of 11 Transpiration The movement of water through a plant from root to leaf 10 of 11 Guard cells Pairs of sausage shaped plant cells that open and close to allow carbon dioxide into the leaf and water and oxygen out (through the stomata) 11 of 11
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