Digestive System
The BRO has a two ways digestive system with a mouth and an anus. It feeds by using it's tentacle to pull prey towards its beak which then venom into the preys exoskeleton rendering it unable to breath or move. The BRO then uses the beak to rip away part of the preys exoskeleton in order to allow the BRO to suck out the flesh from the inside. Their main diet consists of small crab, fish, shrimp, and bivalve shells such as small clams and mussels.
Circulatory System
The circulatory system of the BRO is unique in that is has not one, not two, but three hearts. They have one main heart, called the systemic heart, which is responsible for pumping refreshed blood through the body of the octopus. The two smaller hearts function similarly to the right side of the human heart in that they are responsible for pumping the blood to the gills, which then dumps the waste and loads up on oxygen, and pumping the newly oxygenized blood back to the main heart.
Nervous System
The nervous system of the blue ringed octopus consists of a brain which controls the color changes made in response to mood and surroundings change. The blue ringed octopus has the largest and most complex central nervous system of all invertebrates. This octopus also has chromatophores inside the blue rings, which cause the color change when the animal is under great stress. The color appearing to the blue rings is a warning. It brings color to the rings right before it releases tetrodoxin. Tetrodoxin is a neurotoxin is so potent, it only takes a milligram to kill an adult human within a few hours.
Reproductive System
The blue ringed octopus reproduce sexually.The male blue ringed octopus has an arm used fro reproduction: the Hectocotylus. In this particular octopus, the is appendage is the third arm on the right. The male inserts this into the mantle of the female. The mantle is the head/ base of the octopus body and contains all of the internal organs. There are no distinct/ visible characteristics to distinguish between the male and female. The male initiates, but he female ends the interaction. The female will then lay about 100 eggs. She will guard the eggs, in her arms, for about 50 days or until they hatch. The female octopus will not eat during this time and dies soon after the release of the eggs. The eggs that survive will row and be able to reproduce about four months after hatching.