APPLIED RADIOLOGICAL ANATOMY

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: -Red cells contain a special protein called hemoglobin, which helps carry oxygen from the lungs to the rest of the body and then returns carbon dioxide from the body to the lungs so it can be exhaled. Blood appears red because of the large number of red blood cells, which get their color from the hemoglobin.