miarenn12
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Write a paragraph summarising the need for a heart and circulation (to include diffusion, surface area: volume ratio)
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turkeydinosaur16
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Special exchange systems, such as the heart, are required for large eukaryotic organisms because they have a small SA: volume ratio therefore diffusion alone cannot meet the requirements of all the cells. Consequently, the heart and circulatory system form a mass transport in the body in order remove CO2 and deliver O2 more efficiently. The alveoli are specialised to collectively increase the SA; volume ratio and decrease the diffusion distance, meaning diffusion can occur faster and therefore oxygen can diffuse into and carbon dioxide can diffuse out of the body at a faster rate (Ficks' Law).
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