Transport systems 0.0 / 5 ? BiologyEcology, ecosystems and environmental biologyA2/A-levelEdexcel Created by: francesca_321Created on: 30-01-16 19:28 What is diffusion? the free movement of particles in a liquid down a concentration gradient from high concentration to low contentration 1 of 9 What happens when an organism becomes larger? the smaller the surface area to volume ratio becomes 2 of 9 What about the distance from the outside? the organism to the inside gets longer and there is less surface forsubstances to enter through 3 of 9 Therefore what? It takes longer for substances to diffuse in 4 of 9 What is the definition of osmosis? The movement of water along a concentration gradient through a partially permeable membrane 5 of 9 What is the definition of active transport? energy used to move substances against the concentration gradient 6 of 9 What is the first structure of water? dipolarity 7 of 9 What does this mean? the oxygen is negative and hydrogen is positive 8 of 9 What does the polarity of water allow? attracted to charges, spread out among them water molecules 9 of 9
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