What is the responsibility for hemoglobin?

Answer 1

Hemoglobin transports oxygen from areas of high oxygen concentration-like the lungs- to areas of low oxygen concentration-tissues that need oxygen. Human hemoglobin has four subunits- two beta and two alpha- and each subunit contains an iron molecule that is involved in binding oxygen. These subunits work together and bind oxygen cooperatively in a pretty interesting way. Here is a great explanation from NIH I you'd like to know more: ncbi.nlm.nih.gov/books/NBK22596/

Answer 2

Haemoglobin is responsible transferring oxygen from the lungs to the rest of the body. It is actually the reason red blood cells appear red, although oxygen-rich blood is noticeably brighter than the depleted blood returning to the heart and lungs. Haemoglobin is 97% of the red blood cells while the other 3% is dissolved in plasma. At sea level haemoglobin is 100% saturated and decreases when you go above sea level.