Digestive System
They have a two-way digestive system with a mouth and an anus. The blue-ringed octopus feeds by using its arms to capture its prey and pull it toward the mouth. Then it uses its beak to inject venom through the prey's exoskeleton, paralyzing it so the octopus can eat it.
Reproductive System
They reproduce via sexual reproduction. The male uses his "modifyed arm" (hectocotylus) to transfer the sperm packet into the female's mantle cavity.
The males and females grow to about the same size, the main difference being that the male has a modified arm with a hectocotlyus at the tip.
Life Cycle: Hatches from an egg - Larval stage - Juvenile octopus - Adult (1-2 years old) - Lays eggs - Dies
The males and females grow to about the same size, the main difference being that the male has a modified arm with a hectocotlyus at the tip.
Life Cycle: Hatches from an egg - Larval stage - Juvenile octopus - Adult (1-2 years old) - Lays eggs - Dies
Respiratory System
They have a closed respiratory system. Through the use of gills, the animal is able to filter the oxygen from the water, thus being able to breathe underwater. These octopi communicate via looks, using their chromatophores to change colors.
Nervous System
They have a highly complex nervous system. Their nervous system includes the brain, nerve cords, and neurons.
Skeletal & Muscular Systems
They have no skeletal system, which is why they are so flexable. The muscles of both the limbs (arms and tentacles) are muscular hydrostat.
Circulatory System
They have three hearts, two brachial hearts that pump blood through the two gills, and a third heart that pumps blood through the entire body. Thier blood has hemocyanin, a copper-rich protein, that helps in the transportation of oxygen.