Question

How many time blood goes through the heart during 1 cycle in fish? Why

Answer 1

It goes only one time because first the deoxygenated blood goes into atrium and then into the ventricle (fish's heart has only two chambers) and gets pumped towards the gills. There the blood gets oxygenated and is pumped to all body parts.

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Answer 2

blood goes through the heart of the fish only 1 time during 1 cycle. This happens because fish has two chambered heart, The blood is pumped to the gills for oxygenation from where it is passed directly to the rest of the body.