what is the form of hemoglobin that is responsible for carrying oxygen?
Methemoglobinemia is a condition in which more than 1% of the hemoglobin in red blood cells takes the form of methemoglobin. Methemoglobulin is an abnormal form of hemoglobin (the molecule responsible for carrying oxygen in the blood cells) that is unable to bind to oxygen. A small amount of methemoglobin is normal (less than 1% of hemoglobin).