What is the countercurrent flow and how does it maximize exchange in the respiratory system in animals and humans
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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.
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