The Alien Anatomy of the Octopus: Three Hearts, Nine Brains & Blue Blood

From distributed brains across eight arms to three distinct hearts and copper-based blue blood, the octopus completely rewrote the rules of animal biology. Unlike vertebrates that rely on iron-rich hemoglobin to transport oxygen, octopuses use hemocyanin—a copper-based protein engineered to harvest oxygen in freezing, low-oxygen depths. But running an internal biological supercomputer with viscous, copper-heavy blood demands a massive cardiovascular engine: two branchial hearts to force blood across the gills, and a high-pressure systemic heart to power the body. #octopus #octopusstory #hemoglobin