7. The heart is a hollow muscular organ as big as your fist. Its function is to C. pump the blood to all parts of the body D. give the blood its red color A. receive and keep the blood B. clean and use the blood 8. What is the blood made of? A. Plasma, platelets, red blood cells B. Platelets, red blood cells, red blood cells C. red blood cells, white blood cells D. Plasma, platelets, red blood cells, white blood cells 9: As oxygenated blood travels to the different parts of the body, it unloads the oxygen to the cells then picks up carbon dioxide and brings it back to the heart then to the lungs to be expelled. What blood vessel carries deoxygenated blood back to the heart? A. Vein B. Artery C. Capillary D. Lungs 10. Our blood has white blood cells or leukocytes. What is its function? A. Provide color to the skin. C. Carry nutrients to all cell of the body. B. Identify and fight bacteria & viruses. D. Responsible for blood from clotting.​