During one cycle how many times does blood goes to heart of fishes and why
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In fishes, only one time the blood passes through the heart. This type of circulation is known as single circulatory system.
In fishes, instead of lungs, gills are present which purifies the blood. Deoxygenated blood moves from heart to the gills for the cleaning process and then this oxygenated blood is pumped back to all the other parts of the body.
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