Blood does not contain

Calcium.

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Prothrombin.

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Fibrinogen.

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Elastin.

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Solution

The correct option is B Elastin.
Elastin is a highly elastic protein found in certain connective tissues throughout the body. It is mostly found in the extracellular matrix of the skin and internal organs of the body. Calcium, prothrombin, and fibrinogen are the blood clotting factors present in the blood. Blood is a fluid connective tissue it does not require elasticity hence elastin is absent in blood.
So, the correct answer is 'Elastin'.

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