Why do you need hemoglobin in the blood? What is its function?
The main function of hemoglobin is to carry oxygen. In humans, in the capillaries of the lungs in conditions of excess oxygen, the latter combines with hemoglobin. By the blood flow, erythrocytes containing hemoglobin molecules with bound oxygen are delivered to organs and tissues where there is little oxygen; here the oxygen necessary for oxidative processes is released from the bond with hemoglobin. In addition, hemoglobin is able to bind small amounts of carbon dioxide (CO2) in tissues and release it in the lungs. Carbon monoxide (CO) binds to blood hemoglobin much more strongly (almost 500 times) than oxygen, forming carboxyhemoglobin (HbCO). Some processes lead to the oxidation of the iron ion in hemoglobin to the oxidation state +3. The result is a form of hemoglobin known as methemoglobin (HbOH) (metHb, from meta and hemoglobin, otherwise hemiglobin or ferrihemoglobin, see Methemoglobinemia). In both cases, oxygen transport processes are blocked. However, carbon monoxide can be partially displaced from heme by increasing the partial pressure of oxygen in the lungs.)))
Hemoglobin is part of the red blood cells. And it consists of a compound of iron (heme) and protein (globin). The main function of hemoglobin is to carry oxygen and carbon dioxide between the lungs and cells of other organs. Those. hemoglobin provides metabolism in cells.