Red Blood Cells and Their Functions
Also known as erthrocytes, red blood cells make up 99.9% of the formed elements of blood. They have a red color due to the pigment hemoglobin. The hemoglobin transports oxygen and carbon dioxide. The primary function of red blood cells is to carry oxygen from the lungs to teh tissues around the body. The secondary function of RBCs is getting waste carbon dioxide from the tissues to the lungs, where it can be breathed out.