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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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In multicellular organisms , all the cells of body may not be in direct contact with the surrounding source of oxygen i.e. environment , thus simple diffusion will not meet the oxygen requirements of all the cells . These organisms require specialist organs to meet the oxygen requirement.
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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

  • 36 ml of a gaseous mixture consisting of a gaseous organic compound A and just sufficient amount of oxygen required for complete combustion gives 16 ml of CO_(2) , 24 ml water vapour and 8 ml of N_(2) . The volumes are measured at same temperature and pressure. Volume of O_(2) required for complete combustion

    A
    8 ml
    B
    28 ml
    C
    74 ml
    D
    22 ml

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

    (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?

    Why is energy required by an organism even during sleep?

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    9 volumes of a gaseous mixture consisting of a gaseous organic compound A and just sufficient amount of oxygen required for complete combustion, yielded on burning, 4 volumes of CO_(2) , 6 volumes of water vapour and 2 volumes of N_(2) , all volumes measured at the same temperature and pressure. If the compound A contained only C, H and N, (i) how many volumes of oxygen are required for complete combustion, and (ii) what is the molecular formula of the compound A?

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