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

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

Knowledge Check

  • Assertion (A): Diffusion process does not meet high energy requirement of ulticellular organism. Reason (R): Diffusion is a fast process but only occurs at the surface of the body.

    A
    Both A and R are true, and R is the correct explanation of A.
    B
    Both A and Rare true, but is not the correct explanation of A
    C
    A is true but R is false
    D
    A is false but R is true.

  • 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 .

    A
    (I) and (II) only
    B
    (I) and (III) only
    C
    (II) , (III) and (IV)
    D
    (II) and (IV) only

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