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Gas Exchange

Hello! I was wondering if anyone could help with this question here, 2b. Thank you :smile:
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o0Ashi0o
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hi,

1. The continual movement of water means that the water passing through the worm's gills always has a high conc-n of O2; this is needed for O2 to diffuse into the animal, cos the rate of diffusion of a substance is directly proportional to the concentration gradient.

2. O2 in solution in the water means that the surface of the gills remains moist and this aids diffusion of O2 [similar to the diffusion of O2 from the air in amphibians [the skin of a frog/newt is slimy cos of this - yuck!! :mad: - French people are interesting lol].
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o0Ashi0o
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Thanks so much for the help! :smile:
My pleasure - thanks for the rep!

Be safe!

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