Explain Why A Fish Have A Single Atrium

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I completely agree, it’s fascinating the fact that fish have a single atrium, and ventricle because they have gills and not lungs. The body movement of a fish + helps them to move blood back into their heart which explains why they cannot survive out of the water. A birds cardiovascular system is more effective because of their active way of living they fly, run, swim, and dive. The right ventricle pumps blood to the lungs and the left ventricle pumps blood to the rest of the body. The left ventricle must generate a greater pressure to pump the blood through -out the body.
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