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Why Can't We Breathe Underwater?

Why can't we breathe underwater and how do fish do it? Watch this video to find out. #science #edutainment #educational #fish #aquatics Here's the script: My personal breath-holding record is 3 minutes and 18 seconds. Don't try that at home. I was in a pool surrounded by lifeguards. But why did I have to hold my breath, why couldn't I breathe water like a fish? Humans like you and me have lungs and fish have gills. Aquatic mammals like whales, seals, and otters are on team lungs. When we take a breath air goes into our lungs where carbon dioxide exits our bloodstream and oxygen enters it. Avoli is tiny balloon-shaped air sacs in our lungs that facilitate the exchange of gasses between our blood and the air. Fun fact: a healthy adult lung contains over 300 million alveoli. Meanwhile, gills serve a very similar purpose. Fish also need to intake oxygen and expel carbon dioxide but they do this through gills. Gills are made up of many many capillaries branching out which do pretty much the same thing as alveoli. The main reason why humans can't breathe underwater and fish can't breathe on land is that our respiratory system is optimized for gas, and fish’s respiratory system is optimized for water.