Q.

Metal present in blood is –

A. Calcium
B. Zinc
C. Sodium
D. Iron
Answer» D. Iron
Explanation: Iron is an essential part of the proteins that transport oxygen in the body. Hemoglobin, the oxygencanying protein in red blood cells, accounts for about two-thirds of the body's iron supply. Smaller amounts are found in myoglobin, the protein that supplies oxygen to muscles, and in enzymes needed for various biochemical reactions.
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