how counter current flow in fishes is more efficient than count current flow
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Answer:
Just like animals on land, fish need oxygen to survive – but rather than breathing air, fish extract their oxygen from the water around them. This is no easy feat because air can hold 33 times more oxygen than water, so fish have to be much more efficient breathers than terrestrial animals. Fortunately, fish have evolved a clever way to overcome their oxygen-deprived environment through their highly specialized gills. The gill is where fish absorb oxygen from the surrounding water into their blood. However, oxygen can only diffuse into the blood at the gills if the oxygen level is higher in the water than in the blood – that is, oxygen needs to flow from an area of high levels to an area of low levels.
Fish gills use a design called ‘countercurrent oxygen exchange’ to maximize the amount of oxygen that their blood can pick up. They achieve this by maximizing the amount of time their blood is exposed to water that has a higher oxygen level, even as the blood takes on more oxygen.
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