How does a frog's heart differ from a human's heart?

Frog hearts have two atria and one ventricle, while human hearts have two atria and two ventricles. The frog’s right atrium gets deoxygenated blood out of the vessels that come from the bodily organs, and the left atrium receives oxygenated blood from the skin and lungs. Both of the atria send blood into the ventricle which has two chambers that keep the two sources from mixing. There is no mixing of deoxygenated and oxygenated blood in the human heart, and humans do not absorb oxygen through their skin like frogs.

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