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A substance or complex of substances called prothrombin activator is formed in response to rupture of vessels or damage to the blood itself. The detailed

mechanism by which prothrombin activator is formed are still incompletely

understood, however, both involves a series of plasma proteins, especially beta-

globulins which along with other blood clotting factors like factor IV

(calcium)enter into clotting process.

2.Prothrombin activator catalyzes the conversion of prothrombin into thrombin in the presence of calcium. 3.The thrombin acts as an enzyme to convert fibrinogen into fibrin threads that enmesh platelets, blood cells and plasma to form a hard blood clot. Citrates and oxalates which are commonly used as anticoagulants are effective

because they remove calcium from the blood by formation of insoluble citrate or oxalate

salts of calcium. If calcium is added in excess the clotting power of blood is restored.

In formation of oxy-hemoglobin, oxygen does not combine with two positive

valences of the ferrous iron in the hemoglobin molecule. Instead, it binds loosely with

one of the six "coordination" valences of the iron atom. This is an extremely loose bond

so that combination is reversible. Furthermore, the oxygen does not become ionic oxygen

but is carried as molecular oxygen to the tissue where it is released into the tissue fluids

in the form of dissolved molecular oxygen rather than ionic oxygen. This explains why

blood does not rust despite having the all necessary substrates for the formation of the

rust

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Q: Why does the iron present in the blood does not rust?
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Related questions

Why does an iron nail rust?

Iron present in the nail oxidizes in oxygen to form the iron oxides


You get rust as the final product due to the reaction between iron and oxygen then why do not you get rust despite having both iron and oxygen in our blood?

because you need to have solid iron for it to rust


What is the metal that needs to be present for rust to occur?

FE or Iron


What element makes blood red?

There is a substance called iron in your blood. As you probably know, when iron is exposed to oxygen, it immediately starts to rust, which rust is red. Therefore, when the iron in your blood "rusts'' so to speak, it turns your blood red.


Why do weather rocks have rust streaks?

Some weathered rocks have rust streaks due to the iron content in the rocks. When rocks that have ferrous iron are weathered there will be rust streaks present.


Why do some weathered rocks have rust streaks?

Some weathered rocks have rust streaks due to the iron content in the rocks. When rocks that have ferrous iron are weathered there will be rust streaks present.


What two things need to be present for iron to rust?

Water and oxygen


What two substances must be present for iron to rust?

Oxygen and Water


Which two substances must be present for an iron object to rust?

For the oxidation of iron to occur, that is for ferric oxide to form, there must be oxygen present. There must also be water present.


Is rust a physical or a chemical?

Rust would be a chemical change. Rust is often called oxidized iron because oxygen atoms combine with iron and turn red, just like the red blood cells in your blood stream. When the oxygen in your lungs meets the iron in your blood cells, or when the iron in a nail combines with oxygen in the air, you get that rusty red color.


Does water make iron go rusty?

Yes, as long as oxygen is present aswell, iron will rust.


Which must be present for a piece of iron to rust?

Rusting is the reaction of iron with oxygen in the presence of water.