Red blood cells
Red blood cells or red pythons are red blood cells with a disk-shaped disk. RBCs are donut-shaped cells specialized for oxygen delivery and contain about 280 million proteins, called hemoglobin, with a high oxygen retention capacity. Therefore, one red blood cell can carry about 1,120 million oxygen molecules. This hemoglobin contains iron, which is red, and red blood cells are red. Hemoglobin also accounts for about 95% of the erythrocyte dry weight. And erythrocytes are produced in the bone marrow, and immature red blood cells that are initially produced in the bone marrow have nuclei, but in the process of maturation, the nuclei degrade and disappear. Erythrocytes constitute the largest number of blood cells in the blood, and the average lifetime of normal red blood cells is 120 days. In blood 1 mm³, there are about 5 million men and 4.5 million red blood cells. Red blood cells have a diameter of 7.2 to 8.