The octopus has three hearts.
The octopus has three hearts because the octopus uses hemocyanin to transport oxygen, but combines with oxygen less efficiently, so it has to compensate for this by having three hearts. Two gill hearts feed deoxygenated blood into the gills, which absorbs oxygen, and one main heart receives oxygen-rich blood and transports it to circulate throughout the body.
The octopus is usually what we call an octopus, the octopus is actually a very amazing marine intelligent creatures, it in addition to not only have a heart, in addition to the octopus there are two sets of memory system, can be independent of the memory of things. In the octopus brain also exists in this "primary and secondary functions", octopus has nine brains, a larger is the central system, the remaining eight are located in eight tentacles.
Octopus and squid difference
1, body appearance
Octopus is eight wrists, squid for ten wrists. Octopus body soft, sac-like, looks like a pill. Squid growth with cartilage, the body is long and narrow, as if the tube, cross-section of the circle.
2, food sources
Octopus mainly to shrimp and crab for food, there are some species of food plankton. And squid mainly to krill, sardines, silverhammer, small males and other food.
3, species division
Octopus is also called octopus, is the mollusc phylum cephalopods octopus order of animals in general. And squid is also called soft fish, gun squid, it is is the mollusc phylum cephalopods tube squid order open-eyed suborder animals.
4, food
Octopus can be eaten raw or cooked, and raw food is particularly good. Squid must be cooked before eating, because the body contains a peptide composition, if not cooked through that is eaten, often make people's gastrointestinal motility disorders, resulting in abdominal discomfort.
5, growth habit
Octopus most of the suction cups along the bottom of the sea crawling, frightened, will be from the body tube spray water, as well as quickly change the direction of movement, in addition to encountering danger will also be sprayed out of the ink-like material, as smoke to confuse opponents. Some species produce substances that can paralyze the attacker's sensory organs. The squid has two gills as respiratory organs, and its body is divided into a head, a short neck and a trunk. On both sides of the head there is a pair of developed eyes and carpal legs around the mouth.