When fish take a gulp of water it goes into their gill chambers where the gills are located. When water flows across the gills the oxygen in the water diffuses into their bloodstream. This is actually more difficult than breathing air, even though it’s a more primitive respiratory system.
Gills work like unprotected lungs: inside your lungs are sacs called alveoli. These are responsible for filtering oxygen out of the air and transferring it to the bloodstream. Gills expose similar structures to these sacs, where they essentially do the same thing.
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