Listening Practice on Octopuses Listening Practice on Octopuses Octopuses have elaborate cardiovascular and nervous systems. Their cardiovascular system includes three hearts; two pump blood to the gills, and a third moves blood throughout the rest of the body. Unlike human blood, octopus blood is copper-based, which makes it appear blue. https://www.youtube.com/watch?v=oSyEZAm8nb8&t=104s The octopus nervous system … Continue reading Listening Practice on Octopuses with Flashcards