People also ask
How do fish extract oxygen from the water?
This requires very efficient mechanisms for extraction and the passage of large volumes of water (which contains only about 5% as much oxygen as air) over the absorption surfaces. To achieve this, fishes use a combination of the mouth (buccal cavity) and the gill covers and openings (opercula).
How do fish breathe in water?
Fish breathe through their gills.Oxygen is dissolved in water and the fish use that oxygen. Fishes have Gills on two sides of their heads. They take water through their mouth and take it out of their gills.
Do fish need oxygen to live?
Despite living in water, fishes need oxygen to live. Unlike land-dwellers, though, they must extract this vital oxygen from water, which is over 800 times as dense as air.
How does blood flow through the gills of fish?
Blood passing through the gills is pumped in the opposite direction to the water flowing over these structures to increase oxygen absorption efficiency. This also ensures that the blood oxygen level is always less than the surrounding water, to encourage diffusion.