Red blood cells have a unique structure. Problems with hemoglobin can cause symptoms like fatigue and rapid heart rate. Structure Of Hemoglobin Molekulyarnaya Biologiya Biohimiya Biologiya Red Blood Cells are unique cells. . Red blood cells circulating in the blood stream. Erythrocyte sickling the primary pathologic event in SCD results in dramatic morphological changes in red blood cells RBCs because of polymerization of the abnormal. It lacks a nucleus mitochondria or endoplasmic reticulum. 20 to 30 trillion red blood cells erythrocytes. Red Blood Cells have an unusual structure compared to other cells in the human body. About 15 percent of oxygen dissolves in blood plasma. Red blood cells or erythrocytes are the most abundant cell type in blood and these cells bind oxygen to an oxygen-carrying protein called hemoglobin and transport it to cells to. RBCs circulate in the bloodstream of an average adult.