2007-07-15 12:28:59 · 15 answers · asked by Anonymous in Entertainment & Music ➔ Polls & Surveys
nope
2007-07-15 12:33:05 · answer #1 · answered by Anonymous · 0⤊ 2⤋
Octopi have no bones. They are covered by mantle. The mantle is the muscular covering on the outside of an octopus. Octopi have three hearts. Each gill has a heart that's called the gill heart.
The systolic and diastolic pressures of octopuses at rest are 27/15 millimeters of Mercury, says Martin Wells, a reader at the zoology department of Cambridge University and author of Civilization and the Limpet.
It is high for many marine animals but not for mammals. Humans’ systolic pressure (measured when the heart contracts to squeeze the blood out) is about 120 millimeters of mercury. The lowest (diastolic) pressure (measured when the heart relaxes) is about 80 millimeters. The blood pressure of an octopus is about a fifth that of humans. However, the octopus systolic pressure is twice that of a lobster. Mammals developed more efficient circulatory systems than non-mammals and have correspondingly higher blood pressures.
Circulation systems pump stuff through the body via blood. Blood vessels branch repeatedly and get tiny where exchanges take place, for example in the gills or lungs where the blood picks up oxygen and dumps carbon dioxide. The blood pressure drops as the blood spreads out into a jillion small streams (the capillaries). Animals face a problem: If the pump delivers the blood to the gills or lungs with a heady pressure, little force remains to distribute the blood to the rest of the body.
Most fishes never solved the problem and that’s why their blood pressure is low. The octopus managed a fairly good solution by having three hearts. It’s got two hearts to force blood through the two gills and then a main heart to force the blood everywhere else. They have another problem, though, that they share with lobsters and insects (but not fishes). The red blood cells are not equipped with hemoglobin (like ours and fish are) but rather with a poor oxygen carrier, called hemocyanin.
2007-07-15 12:41:07 · answer #2 · answered by bwlobo 7 · 1⤊ 0⤋
Two pump blood through each of the two gills, while the third pumps blood through the body.
Octopus blood contains the copper-rich protein hemocyanin for transporting oxygen. Less efficient than the iron-rich hemoglobin of vertebrates, the hemocyanin is dissolved in the plasma instead of being bound in red blood cells and gives the blood a blue color. Octopuses draw water into their mantle cavity where it passes through its gills.
2007-07-15 12:32:58 · answer #3 · answered by iluvafrica 5 · 4⤊ 0⤋
Yes they do, two are used to pump blood to the gills, and one does it to the rest of the body. Interesting huh?
2016-05-18 21:17:35 · answer #4 · answered by Anonymous · 0⤊ 0⤋
i looked up your topic under a google search engine and found a really interesting page look here and read on!
http://jrscience.wcp.muohio.edu/fieldcourses03/PapersMarineEcologyArticles/Octopus.html
2007-07-15 12:36:11 · answer #5 · answered by WHaTs hEr NAMe 2 · 1⤊ 0⤋
In case one gets broken they have a backup
2007-07-15 12:32:20 · answer #6 · answered by fordperfect5 7 · 0⤊ 2⤋
This question belongs to the wrong section. Go to the Biology one.
2007-07-15 12:30:57 · answer #7 · answered by Adriana 5 · 0⤊ 3⤋
why do cows have 4 stomachs?
2007-07-15 12:31:25 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Tres EMO.
2007-07-15 12:36:36 · answer #9 · answered by Anonymous · 0⤊ 1⤋
IDK but when my son was younger he thought he had 3 B@ll$...not kidding here!!! lol!!!! and the funny part or embarrassing part was he would go around and tell everyone who would listen!!!
2007-07-15 12:37:34 · answer #10 · answered by ♥Jennifer♥ 4 · 0⤊ 1⤋
Been doing your homework, haven't you?
2007-07-15 16:10:02 · answer #11 · answered by sunshine&smiles 5 · 1⤊ 0⤋