Question: What is the function or purpose of the red blood cell? Need Assignment Help? (Select all that apply) Choose at least one answer. a. One of the functions is to fight foreign invaders in the body. b. One of the major functions of the RBC is to carry oxygen. c. The RBC passes through the lungs where they load up on oxygen and then carry them through the arteries and capillaries. d. They are the carriers of hemoglobin.