Right atrium

... mixed. This is done by the arrangement of the frogs heart, where the right atrium dips downward into the ventricle. Which causes oxygen-poor blood that is entering the ...

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Hi, at a guess, the tricuspid valve (separating the right atrium from the right ventriclel) has three cusps (flaps) simply because the diameter of the right ...

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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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