PATHOLOGY

Detailed explanation-1: -Hemoglobin is made up of four protein chains that each bind an additional ring-shaped chemical structure called heme . Our red blood cells are red because of the heme groups in hemoglobin. In turn, our blood is red because of the millions of red blood cells that it contains.

Detailed explanation-2: -The red colour of the blood is due to the presence of iron-containing protein called haemoglobin. Haemoglobin is involved in carryong oxygen from the lungs to different parts of the body.