How many hearts does an octopus have? Octopus has three hearts and nine brains. Octopus has blue blood. This fact is stranger than fiction. The central brain of the octopus controls the nervous system. In each octopus’s arms, there is one brain. The brain is a cluster of nerve cells. In the three hearts of octopuses, a systemic heart is responsible for the circulation of blood in the body. Octopus has two branchial hearts that helps the blood to pump through two gills.

:purple_heart: Octopus is related to almost 300 species of soft-bodied, eight-limbed mollusks of the order Octopoda. This order is then grouped into the class Cephalopoda. This class includes cuttlefish, nautiloids, and squids. Like all other cephalopods, the octopus is also bilaterally symmetrical. These cephalopods have two eyes and a beak, the mouth is at the center of eight limbs. The soft body can easily change its shape so that octopus squeezes from small gaps.

:purple_heart: They take their eight appendages with them when they swim. They have a siphon that is used for both locomotion and respiration through expelling a jet of water. Octopus has a complex nervous system. Their eyesight is very strong. In all of the invertebrates, octopuses are the most behaviorally diverse and intelligent.