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

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