Compared to many other animals, octopuses have rather a
complicated circulatory system to ensure oxygenated blood reaches the
extremities of their multi-limbed body. Octopuses pump their blood around
their circulatory system using three hearts instead of one. While a ‘systemic’
heart supplies the animal’s body, two ‘branchial’ hearts supply each of the two
gills where the blood is oxygenated
Read more: Why octopuses have three hearts: when three are better than one | Discover Wildlife
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