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Question

How many chambers are present in the heart of a fish? How many times does the blood flow through its heart during each cycle?

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Solution

The heart of a fish has two chambers namely, an atrium and a ventricle. Blood enters via the atrium and after circulation it leaves the fish poorly oxygenated. Later, the blood is pumped into the ventricle.
The blood flows only once in the fish. First the deoxygenated blood enters the atrium and then enters the ventricle. The blood is pumped towards the gills where the blood gets oxygenated and pumped to all body parts.

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