PATHOLOGY

Detailed explanation-1: -Octopuses have blue blood, three hearts and a doughnut-shaped brain.

Detailed explanation-2: -How Many Hearts Does an Octopus Have? An octopus has not one, but three hearts. Two of them-the branchial hearts-pump blood to the gills where it picks up oxygen. The third, or systemic heart, pumps the oxygenated blood around the body, fueling up the eight tentacles for whatever they and their suckers plan to do.

Detailed explanation-3: -Two of the hearts work exclusively to move blood beyond the animal’s gills, while the third keeps circulation flowing for the organs.