What is the role of hemoglobin in the body answers?

Carries oxygen from pulmonary alveoles to tissue and returns carbon dioxide from tissue to the lungs. and has Fe ions that gives blood the specific red color. and veins specific purple red color is given after oxygen is realesed to the tissue by oxihemoglobine (at low ph and high temperature because at those conditions the hemoglobine capacity of bonding dicreases).