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    hard plz help

    1) Very small organisms such as amoeba do not have specialised gas exchange systems. Mammals are large, multicellular organisms and have a complex gas exchange system. Explain why the mammal needs such as system when the amoeba does not

    2) Bony fish rely on gills for gas exchange

    (a) Why does the highly folded structure of the gills increase the efficiency of gas exchange?

    (b) Explain how the counterflow mechanism works in bony fish

    c) Suggest why gill lamellae would not provide an efficient gas exchange surface on land

    3) Name two similarities and two differences between the gas exchange of an insect and that of a mammal.

    1. Omoeba as a larger surface area to volume ratio, hence they don't need such a complex system, however, mammals have a small surface are to volume ratio, hence they needsuch a system to control breathing and respiratory rate.

    2a) Large surface area, hence can allow more oxygen uptake.
    b) Have no idea.

    3) Forgot

    I did f211 ages ago, so I forgot this info!
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Updated: March 22, 2011
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