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Octopuses have a closed circulatory system, in which the blood remains inside blood vessels. Octopuses have three hearts; a systemic or main heart that circulates blood around the body and two branchial or gill hearts that pump it through each of the two gills. The systemic heart becomes inactive when the animal is swimming.
The octopus has three hearts, one main two-chambered heart charged with sending oxygenated blood to the body and two smaller branchial hearts, one next to each set of gills. The circulatory circuit sends oxygenated blood from the gills to the atrium of the systemic heart, then to its ventricle which pumps this blood to the rest of the body.
All living cephalopods have a two-part beak; [11]: 7 most have a radula, although it is reduced in most octopus and absent altogether in Spirula. [ 11 ] : 7 [ 97 ] : 110 They feed by capturing prey with their tentacles, drawing it into their mouth and taking bites from it. [ 24 ]
This octopus is named for the false eye spot (ocellus) under each real eye. These ocelli are an iridescent blue, chain-link circle, set in a circle of black. On its arms, the octopus possesses many "suckers" that it uses to taste. They have three hearts, two gills, blue blood, and a donut-shaped brain. [5]
Recently, scientists have witnessed a species of octopus, the gloomy octopus (Octopus tetricus), engaging in even more extraordinary acts than previously.
Branchial hearts are accessory pumps that supplement the action of the systemic heart in a cephalopod's body. They are myogenic in nature. [1] Branchial hearts are always in pairs located at the base of the gills. Each branchial heart consists of a single chamber. [1] [2] They pump blood through the gills via the afferent branchial veins.
Octopuses also have strong beaks that they could bite a human with. With the exception of the blue-ringed octopus all octopus bite with their large beaks and inject venom, but the venom is not fatal.
Unlike most other octopus species, whose lifespans normally span only one year, the giant Pacific octopus has a lifespan of three to five years. [3] They reach sexual maturity at one to two years of age. [34] Gonadal maturation has been linked to the optic gland of octopuses which has been compared functionally to the vertebrate pituitary gland ...