Hemoglobin and hemocyanin

Such a comparison does not seem absurd to a biologist. Perhaps he will only advise adding one more word to this phrase: blue, like the blood of an octopus or, say, the blood of a horseshoe.

Human blood and other vertebrates red color indicates hemoglobin - a substance that carries oxygen from the lungs to the outermost corners of the body

Human blood and other vertebrates red color indicates hemoglobin - a substance that carries oxygen from the lungs to the outermost corners of the body. Vertebrate animals are found in red blood cells, most invertebrates are dissolved in blood plasma and may be present in other tissues. The composition of hemoglobin is iron, and its coloring property is well known - remember rust. To associate oxygen with hemoglobin, cooperativity is characteristic: after the addition of the first oxygen molecule, the subsequent binding is facilitated.

Hemoglobin is one of the main proteins that feed malaria pathogens, and hereditary anomalies in the structure of hemoglobin are very common in malaria endemic areas of the globe, which make it difficult for malarial plasmodia to feed on this protein and penetrate the erythrocyte.

Deficiency of hemoglobin can be caused, first, by the decrease in the number of molecules of hemoglobin itself, and secondly, because of the reduced ability of each molecule to bind oxygen at the same oxygen pressure.

In the blood of the octopus, there is no hemoglobin, but there is another substance that performs the same task - hemocyanin. It should be noted that the hemocyanin of mollusks and arthropods differs in structure and some properties, in addition, there are hemocyanins that perform other functions besides the transfer of oxygen. Hemocyanin, like hemoglobin, shows cooperativity, that is, when an oxygen molecule is attached to one subunit, it increases the affinity for the oxygen of neighboring subunits. Hemoglobin and hemocyanin are very similar in chemical composition - only in the place of iron in the hemocyanin is copper present.

But as regards the basic business quality, which is famous for hemoglobin and hemocyanin - the ability to saturate with oxygen - the first almost three times superior in this respect to the second. Therefore, hemoglobin is part of the blood of mobile animals (for example, vertebrates) or those that live in an environment poor in oxygen (worms).

Blood of different colors is sometimes inside a single biological species. For example, the pond snail has blue blood, and the coil has a red one.

Today, the possibility of using hemocyanin in medicine as a component of antitumor vaccines is being studied.

The percentage of elements in percentages Fe Cu
The dog's blood 0,34 -
The blood of the octopus - 0,38

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