name the respiratory pigment containing zinc?

respiratory pigment in human blood is haemoglobin in the red blood cells .
it combine with oxygen to form an unstable oxyhaemoglobin n thu transporet oxygen to all body parts n onreleasing oxygen it again becomes haemoglobin
it collects carbon dioxide from body parts n combine with it to form unstable carboxy haemoglobin n carry it in that state to lungs where it release carbondioxide into exhaled air nagain becomes haemoglobin