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2024 EXCHANGE SURFACES EXAM WITH VERIFIED SOLUTIONS

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Why do multicellular organisms need specialised exchange surfaces but single celled organisms don't? - ANSWER single celled organisms can exchange materials across their CSM to meet requirements - metabolic activity low → O2 needs low + CO2 produced is low - large SA:V ratio Multicellular organisms are the opposite - high metabolic rate (active + maintain temp) - small SA:V ratio 3 main features of an efficient exchange surface - ANSWER • increased surface area • thin layer • ...

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  • by contenthive76 • 
  • uploaded  25-01-2024
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