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

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