EVERYDAY SCIENCE

Detailed explanation-1: -Hemoglobin is the iron-containing respiratory pigment in humans and is present in the red blood cells. Hemoglobin is a tetrameric protein and contains the heme prosthetic group attached to each subunit. The characteristic red color of red blood cells is due to the presence of hemoglobin.

Detailed explanation-2: -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.

Detailed explanation-3: -Hemocyanins are copper-containing respiratory pigments found in many mollusks (some bivalves, many gastropods, and cephalopods) and arthropods (many crustaceans, some arachnids, and the horseshoe crab, Limulus). They are colourless when deoxygenated but turn blue on oxygenation.

Detailed explanation-4: -Oxygen is carried by a red pigment called haemoglobin present in the red blood cells.

Detailed explanation-5: -The Red Blood Cells (RBCs) contain a red pigment called haemoglobin which transports oxygen and also gives blood its red colour.