why does the blood not clot inside uninjured vessels & it contains iron but it does not rust ! why ? please answer them asap as my activation period will be finishes tomorrow .

Asked by paritosh mahajan | 7th Jun, 2013, 11:06: AM

Expert Answer:

Blood contains haemoglobin which contains iron. Oxygen binds with haemoglobin to form oxy-haemoglobin. In formation of oxy-haemoglobin, 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.

Answered by  | 14th Jun, 2013, 10:36: AM

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