Match these items. 1. the basic unit of living things function 2. to perform in the required way capillaries 3. a part of the body made of different kinds of tissue to perform a specific function veins 4. anything that is built or created in an organized manner cell 5. a specific group of organs which work together as a unit arteries 6. blood vessels that carry blood back to the heart structure 7. pass waste from cells to veins organ 8. vessels that carry blood away from the heart system