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why does an octopus have three hearts

An Octopus has 3 Hearts, 9 Brains Blue Blood
August 22, 2012 in This NOAA Fisheries video features spectacular underwaterб footage of octopus swimming and eggs hatching. б NOAA researcher Liz Conners of the Alaska Fisheries Science Center points outб the challenges of managing the Pacific octopus in Alaska and how researchers are working to develop new technology to better capture, tag, and study the octopus. The research study is a collaborative effort among the North Pacific Research Board, NOAA s Alaska Fisheries Science Center, the University of Alaska Fairbanks, and the Alaska fishing community. б 1. A 50-pound octopus can squeeze through a hole only 2 inches in diameter. If their beak fits, they can get through. 2. Theyб are about 90 percent muscle. 3. You can tell a male octopus from a female by looking at the tip of its third arm on the right (starting between the eyes and going clockwise). Males have a special tip on this arm that has no suckers on the last few inches. This specialized tip is visible even in immature octopus. To mate, the male inserts this special arm into the female s body cavity.

A captured male will try to protect this arm. 4. Female octopus can wait until months after mating to fertilize the eggs. 5. An average female Giant Pacific Octopus in Alaska can lay 90,000 eggs. 6. Fishermen like to cut off the tip of an octopus arm and use it for halibut bait because it continues to wiggle even after being cut off. 7. Octopus frequently lose an arm to predators, but they grow back. 8. Giant Pacific Octopus are cannibals. They will happily kill and eat smaller octopus. 9. All species of octopus have venom. The venom of the Giant Pacific Octopus is not dangerous to humans, but Australia s blue-ringed octopus is known as one of the most poisonous marine animalsБits venom is deadly to humans. 10. Octopus actually have shells similar to clams and snails. There is a pair of small, spike-shaped structures called stylets inside the octopus body that are a vestigial shellБmeaning it really has no function. 11. It is tempting to use octopi as the plural of octopus, but DON T DO IT. БOctopiБ would be a proper Latin plural, but the word БoctopusБ has a Greek, rather than a Latin, root.

The correct use is to use the word БoctopusБ to refer to one or several individuals of a single species; use the plural БoctopusesБ only when talking about multiple species. 12. An octopus has three hearts, nine brains, and blue blood. Two hearts pump blood to the gills, while a third circulates it to the rest of the body. The nervous system includes a central brain and a large ganglion at the base of each arm which controls movement. Theirб blood contains the copper-rich protein hemocyanin, which is more efficient than hemoglobin for oxygen transport at very low temperatures and low oxygen concentrations. To view the Creative Commons license for the image, click. Tags:, Yes, Finding Dory is right about this. Having multiple hearts isn t as odd as it might seem. Although one might be advised to keep one s brain and one s heart, as well as one or two other organs, separate when making important decisions, a heart and a brain are metaphorical of each other in this regard.

Nervous systems can exist and function without brains, but in many animals clumps of neurons known as ganglia concentrate neural function. The same sort of electric and chemical interactions occurring across a network of neurons can have more complex functions when the neurons are grouped together. A brain is an extreme example of this. Similarly, blood vessels can have muscular tissue that contracts in a way that causes blood flow, as is the case with the arteries in human bodies. A heart is, in a way, a more extreme and complex version of that. So, worms, hagfish, and octopuses have more than one heart doing similar yet different things. In the octopus, two hearts, called branchial hearts, pump blood through each of the two gills, and the third heard pumps blood through the rest of the body. Time Lords, such as The Doctor, have two hearts, but the evolutionary background for this is unknown. However, it is likely that Time Lords and Old Ones have something of a history together.

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