in microscopic world, countless vibrant erythrocytes, red blood cells, traverse circulatory system, tirelessly carrying

hypochromic iron bloodstream blood hematologist red hematocrit rbcs hematopoiesis hematology microcytes heme bloodrelated lifespan medical oxygencarrying health erythrocytes hemoglobin morphology oxygenation normocytic erythropoiesis erythrocyte cell macrocytes anemia ironrich capillaries ai generated