How do fish gills convert water to oxygen, if it does already?
In: Biology
Gills act similarly to the sacs in your lungs. They present a gas permeable barrier (a substance that gases can pass through but other substances, like water, can’t) to the water flowing through the gills. This allows oxygen to be absorbed directly into the blood vessels without respiration.
You can watch fish and notice that if they are not moving the flaps over their gills will be. This ensures fresh water, with oxygen, is passing through. A fish that neither moves or has moving gills will die from asphyxiation.
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