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Here it comes again, a counter current exchange system, similar to the one we found in the fish's swim bladder and in the tuna's muscles.
The circulation of blood in fish is simple. The heart only has two chambers, in contrast to our heart which has four. This is because the fish heart only pumps blood in one direction. The blood enters the heart through a vein and exits through a vein on its way to the gills. In the gills, the blood picks up oxygen from the surrounding water and leaves the gills in arteries, which go to the body. The oxygen is used in the body and goes back to the heart. This is a very simple closed-circle circulatory system...
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