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Why can't humans breathe underwater
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When you breathe in air,The air that you breathe travels into your nose down into your windpipe and into your lungs.
Oxygen has water in it; our lungs are designed to remove oxygen from the air not the water.
Why can't humans breathe underwater
By Ethan Mash
since humans do not have gills, we cannot extract oxygen from water.
Air has about 20% oxygen, but water has a lot less oxygen in it. Fish need less oxygen than we do because they are "cold-blooded", what scientists call "exothermic",Meaning they get their heat from outside their bodies.
Fish also need oxygen to live, but their lungs are not designed to extract oxygen from the air. Instead by passing the water through their specialized organs called gills, they can remove the oxygen and eliminate waste gases.
Sources
So why can't fish breathe on land?
www.livescience.com/why-can't-human-breath-underwater
http://scienceline.ucsb.edu
www.thehindu.com
It's because gills need to be immersed in water to support their weight. Outside water, the gills would collapse like wet tissue paper, and lose their capacity to exchange gases.
Why can't we use this oxygen?
Animals rely on a minimum amount of dissolved oxygen to survive. Problem is, this amount is usually oxygen present in air.
Why can't we breathe under water if it has oxygen in it?
That's because our lungs don't have a surface area to keep the oxygen that's in the water. And humans don't have build in filtering system like human's.