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

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