Q. How does haemometer determine the blood content of hemoglobin?

Answer

The oxygen (O2) in inspired air is carried by the blood from the lungs to every cell in the body, and the carbon dioxide (CO2) is carried back by the blood from the cells to the lungs, where it is expelled from the body as expired air. Hemoglobin (HB) molecules are generally spherical and made up of two sets of subunits that are structurally distinct from one another. Each of HB's four polypeptide chains has a heme pocket, which serves as the protein's oxygen-binding site. Here, a single oxygen atom makes a reversible bond with the ferrous iron, and the resulting oxyhemoglobin contains four oxygen molecules (O2HB).