What is the role of hemoglobin's heme group in the transport of oxygen?

A To bind and transport carbon dioxide
B To facilitate the binding of oxygen to the globin chains
C To act as an antioxidant, protecting the red blood cell from damage
D To bind and transport oxygen from the lungs to the tissues
The heme group in hemoglobin is responsible for binding and transporting oxygen from the lungs to the tissues.
Guyton and Hall Textbook of Medical Physiology
Hematology Hematology: Hemoglobin and Oxygen Transport Hematology: Hemoglobin and Oxygen Transport Easy MEDICAL Confidence: high