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    is this correct

    any surfaces permeable to gases e.g O2 and CO2 will be permeable to water (as its a smaller molecule) therefore all gas exchnage surfaces must be moist as water diffues out of the organ

    ????
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    i thought that they were moist to make diffusion easier but i dunno
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    They are moist so that the gases can dissolve and diffuse faster.
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    (Original post by hussain)
    is this correct

    any surfaces permeable to gases e.g O2 and CO2 will be permeable to water (as its a smaller molecule) therefore all gas exchnage surfaces must be moist as water diffues out of the organ

    ????
    No, that wouldn't mean that water needed to be present.
    Rather, the gases dissolve in water and then diffuse through. If they weren't dissolved in water they wouldn't stick (i.e. they'd still be gases and float away, lol)
    Does that make sense? I'm hot and my brain's not 100% working
    skevvybritt x
 
 
 
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