MICROANATOMY

Detailed explanation-1: -Oxygen is carried by a red pigment called haemoglobin present in the red blood cells.

Detailed explanation-2: -Hemoglobin carries oxygen to the cells. This respiratory pigment of the blood transports oxygen and carbonic anhydride, regulates pH balance, gives rise to bilirubin, and gives the blood its red color.

Detailed explanation-3: -Haemoglobin is the iron-containing pigment that enables red blood cells to carry high concentrations of oxygen to the tissues.

Detailed explanation-4: -Hemoglobin itself is a compound of a colorless protein, globin, and an iron porphyrin pigment. In general the pigments formed by the combination of iron with the various porphyrins are called hemes.