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Cashar 7 / 9
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Muuqaalku weli diyaar ma aha.
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I can explain how exchange surfaces and transport systems enable cells in multicellular organisms to be quickly supplied with substances they need to stay alive.
Muuji qoraalka
Consequences for living organisms of relationship between surface area:volume ratio and diffusion time.
Reasons why a small surface area (relative to volume) could be a disadvantage to living organisms.
The circulatory system minimises diffusion distance for oxygen and food molecules so cells can be supplied quickly.
Examples of exchange surfaces in humans (e.g. alveoli in lungs, villi in digestive system).
The exchange surfaces are adapted to maximise surface area for diffusion of particles of essential substances and waste.
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weli lama diyaarin
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Imtixaankan weli diyaar ma aha.
Waxa ardaydu arkaan
Tan waa isla casharka sida ardaygu u arko. Waxaad qayb kasta u dirsan kartaa ardayda.
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