bio 0.0 / 5 ? BiologyBiological moleculesASEdexcel Created by: Eva FarendenCreated on: 14-10-13 16:11 What is the heart and circulation's primary purpose? To move substances around the body 1 of 5 In very small organisms, such as unicellular creatures, substances such as oxygen CO2 and digestive products are moved around by? Diffusion 2 of 5 What is diffusion? The movement of molecules or ions from a region of their high to a region of their low concentration by relatively slow random movement of molecules 3 of 5 Most complex multicellular organisms are too large for diffusion to move substances around their bodies quickly enough. What do these animals have? A heart and circulatory system. 4 of 5 Open circulatory systems s 5 of 5
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