Question

Why the RBC only has heamoglobin?

Answer 1

due to the iron molecules present in the hemoglobin which have high affinity towards RBC's....

Answer 2

$Answer:-$

Red blood cells contain hemoglobin,which contains four iron-binding heme groups. Oxygen binds the heme groups of hemoglobin. Each hemoglobin molecule can bind four oxygen molecules. The binding affinity of hemoglobin for oxygen is cooperative.