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Do All Animals Have Red Blood?
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The color of blood is related to the compounds that transport oxygen. Hemoglobin, containing iron, is red and is found in all vertebrates (animals having a backbone) and a few invertebrates (animals lacking a backbone). Annelids (segmented worms) have either a green pigment, chlorocruorin, or a red pigment, hemerythrin. Some crustaceans (arthropods having divided bodies and generally having gills) have a blue pigment, hemocyanin, in their blood-we have several examples of animals that don’t have them.
Antartic Ice Fish (family Channichthyidae) don’t have ‘red’ blood cells because they don’t have hemoglobin – hemoglobin doesn’t work very well at cold temperatures.
Insects (like many other invertabrates) have hemocytes (an equivalent to a red blood cell). They are bluish in color because of the hemocyanin they contain.
Lobsters and crabs (among other crustaceans) use hemocyanin dissolved in their plasma to transport oxygen – they have no red blood cells at all!There are others but better yet I can give you two WHOLE divisions of animals without blood cells. The Platyhelminthes (Flatworms) and the Nematoda (Nematodes) don’t even have circulatory systems!
I think less might be the case as insects alone account for nearly 10 million species!
Posted by anjali989 on September 6, 2012 at 7:54 AM (Answer #1)
Not all animals have red blood. The color of blood depends upon the type of compound or respiratory pigment within the blood that transports oxygen from the lungs to the tissues. In all vertebrates (animals having a backbone) and a few invertebrates (animals lacking a backbone), an iron-containing protein called hemoglobin is responsible for oxygen transport. Hemoglobin is a red pigment and gives the blood a red color.
Annelids (segmented worms) have either a green pigment, chlorocruorin, or a red pigment, hemerythrin. Some crustaceans (invertebrates with jointed bodies, such as crabs and shrimps) have a blue pigment, hemocyanin, in their blood. Cockroaches have no respiratory pigment, thus their blood is colorless.
Source: New Encyclopaedia Britannica, 15th ed., vol. 2, p. 290.
Posted by fact-finder on October 10, 2011 at 4:00 PM (Answer #2)
Reply to fact-finder: Omg cool! I'm gonna go kill a cockroach!
Posted by school-help-needed on April 13, 2012 at 7:45 AM (Answer #3)
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