Biology, 23.04.2020 17:49, cia196785920

In the countercurrent exchange system of fish gills, blood and water flow in opposite directions. blood flow in the gills reverses direction with every heartbeat. blood and water are separated by a thick polysaccharide barrier. blood and water flow in the same direction.

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In the countercurrent exchange system of fish gills, blood and water flow in opposite directions. bl...