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Across 2. Largest organ of the body 4. Thigh bone 5. Produces and protects bacteria that are beneficial in the function of the human colon 7. The smallest unit of an organism that is classified as living 9. Located just under the stomach 10. Protects the head against injury 12. Elbow bone 13. Located on the tongue 14. The centre of the nervous system 15. A small non-vital organ which aids in the digestive process 16. A large bone that runs down your back 20. The largest gland in the human body 21. A tube connecting to the lungs 23. Runs from the stomach to the anus 25. Curved bones which form the rib cage

Down 1. A joint connecting the femur, patella and the tibia 3. A long bone that runs from shoulder to elbow 6. Any bone located in the finger or foot 8. Essential for breathing 10. Where the food breaks down 11. Muscle of the femur 17. Two organs in the abdomen which remove waste from the blood 18. Carries the blood around your body 19. The joint between the femur and acetabulum 22. Pumps blood around 23. The coloured part of the eye 24. Organs that enable us to see