IMMUNOLOGY

Detailed explanation-1: -Haemoglobin (Hb) is a protein present in RBCs of organisms, carrying oxygen to the tissues and organs and CO2 from organs and tissues back to the lungs. It is made of globin protein with heme as a prosthetic group. Hb is red due to the presence of the heme group, thus making the blood red-coloured.

Detailed explanation-2: -Red blood cells get their bright red color from a protein that allows them to carry oxygen from your lungs and deliver it to other tissues in your body (hemoglobin).

Detailed explanation-3: -Red blood cells contain a protein called hemoglobin, which carries oxygen from the lungs to all parts of the body.

Detailed explanation-4: -Human blood is red because of the protein hemoglobin, which contains a red-colored compound called heme that’s crucial for carrying oxygen through your bloodstream.