If humans did not have lungs, but instead their skin was thin and moist for gas exchange, they would struggle to meet the oxygen demand of the tissues. Why does this not work?

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    The skin would not provide a great enough surface area for gas exchange.
    The connection to the circulatory system would be lost.
    Temperature control would become very difficult.
    The external air does not contain a sufficient amount of oxygen for sufficient gas exchange.

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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The skin would not provide a great enough surface area for gas exchange.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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