Right atrium

Mith, I've explored that option. There are some that believe that it is a remnant of the ductus arteriosus, but animals like opossums never have an ductus arteriosus and have the same setup for venous return...

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Yes, this is the human heart. Bronchial circulation (feeding the lungs themselves) does indeed dump deoxygenated blood into the left atrium. I know that this is not a significant issue, it just makes me curious. I have found no real answers to explain this.

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In human heart, oxygenated blood goes into left atrium by vena pulmonalis, but deoxygenated blood comes into R atrium, then goes ... ventricle, but still oxygenated blod goes into left, and deoxygenated into right atrium. Reptiles - only crocodiles have, just like Aves(birds) and Mammalia, ...

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Deoxygenated blood is being pumped into the left atrium which contains oxygenated blood. Mixing deoxygenated blood with oxygenated blood doesn't seem logical. I know that this amount of deoxygenated blood from the bronchial circulation is a small ...

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... I have searched extensively for this answer and I am having no luck. Why does the bronchial circulation dump deoxygenated blood into the left atrium? Thanks. Hope you can help.

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