Octopus: Three Hearts, Blue Blood
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Did you know there is an animal that has not just one but three hearts And its blood is
not red it is blue. This is the octopus one of the most intelligent animals in the sea.
It has 3 hearts in its body. Two hearts pump blood to the gills where the blood
absorbs oxygen. And the third heart pumps that oxygen-rich blood to the rest of the body.
But the most amazing thing is the octopus’s blood is blue. Because its blood contains a copper-based
protein called hemocyanin. Not iron copper carries oxygen, which makes the blood appear blue.
This blue blood helps them survive in cold and low-oxygen waters. In other words nature
has designed their bodies in such a way that they can survive even in harsh environments.
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