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Why is diffusion insufficient to meet th...

Why is diffusion insufficient to meet the oxygen requirements of multicelluar organisms like humans?

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Simple diffusion is insufficient to meet the requirements of multicellular organisms like humans because multicellular organisms, are not in direct contact with the surrounding environment as they are covered by layers.
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Explore conceptually related problems

(a) Why is diffusion insufficient to meet the oxygen requirements of large multicellular organisms like humans? (b) What type of arrangement exists in the bodies of large animals to meet their oxygen requirements adequately ? (c) What advantage a terrestrial animal has over an quantic animal with regard to obtaining oxygen for respiration?

Case 2 : the biological process involved in the removal of harmful metabolic wastes from the bosy is called excertion .Different organisms use varied strategies to do this Many unicellular organisms remove these wastes by simple diffusion from the body surface into the surrounding water while complex multicellular organisms use specialised organs to perform the same function . Which of the following statements (s) is (are) true about excretion in human beings ? (I) Urine is stored in the urethra until the urge of passing it out . (II) Kidneys are the primary excretory organs . (III) The bladder is muscular so it under nervous control . (IV) Each kidney has large numbers of filtration units called nephrons .

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