Average person has 5-6 liters of blood. Platelets - aid in blood clotting 3. Blood is a transport system. O 2 from the lungs to body cells b. food substances from the digestive tract to body cells. CO 2 from body cells to the lungs.
Blood clots can form on an outer wound or internally.
Blood types . Rh factor - refers to the presence of certain proteins in the blood. Lymph vessels bring lymph back towards the heart an drain into a large vein near the heart. Special lymph organs. Destroys bacteria and other foreign substances.