. red blood cell or (RBC), the most common type of cells is blood and in the body of vertebrates, the main role of delivering oxygen to the lungs (or gills) to the tissues of the. game.

red blood cells coin-like(concave completed that satisfies both), but small and lacking core and other women. Therefore, the only source for the supply of its energy in the process of glycolysis. In natural conditions its diameter, to an average of 7٫5 micron can . If the cell size smaller than 6 microns and if larger than 9 Micron. called. The presence of red with different sizes in the blood (Anisicytosis) and their presence with various forms in the blood Powai (Poikilocytosis) call, which in a state of morbid can be seen. The number of red in the natural state in women's blood 3 of 6 to 5. the 5 million, and in the blood of Men, 4. the 1 to 6 million currently. The volume ratio of blood cells to whole blood based on % hematocrit). This ratio in healthy men and women and adult, respectively, equal to 45-35, and 50-40 percent.

cytoplasm red sponge has been by means of the membrane significant rebound surrounded, these cells can change shape and give of the capillaries, the narrow pass.

within the cytoplasm of blood cell pigment called hemoglobin, there is a protein iron. Red blood cells by hemoglobin in the places where the density of oxygen is too much, the iron with oxygen, combined, and oxy-hemoglobin make and where the density of oxygen to be decomposed and release oxygen. This property of hemoglobin in the displacement of oxygen from the lungs to the tissues, and very beneficial. Life span of each RBC is about four months. After this period the blood cells in the liver is decomposed, and the iron contained in the liver Reserve can red blood cell and its life of 120 days.