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Why humans don’t breath under water?

Published Friday, June 01, 2007 by R. Edmondson | E-mail this post

Most animals including humans have gills in their early fetal stage of development in the womb. However, they lost this organ further into their development since it has no essential function toward sustaining and maintaining live. Therefore mammals which includes humans cannot breathe underwater because our lungs do not have enough surface area, that is necessary to absorb enough oxygen from water. Furthermore, the lining in our lungs is adapted to handle air rather than water. Fish on the other hand, retained these gills, which are necessary for their survival in their environment (water medium). Gills are very efficient at removing oxygen from water due to their feathery structure that greatly increases the surface area for gas exchange. Hence, gills play an important role in the anatomy of fish.

Related Article:
Why dolphins and whales don’t use gills to breathe?

Labels: Animals, Biology, Science

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I'm R. Edmondson
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