Across
- 4. primary muscle used for breathing (7 letters)
- 6. The largest organ in the human body (6 letters)
- 7. largest artery in the body (4 letters)
- 8. The organ responsible for pumping blood (5 letters)
- 9. The part of the brain responsible for coordination (9 letters)
Down
- 1. system that includes muscles and bones (7 letters)
- 2. The protective covering of the brain and spinal cord (9 letters)
- 3. Fluid that circulates through the blood vessels (4 letters)
- 5. Bone found in the upper arm (3 letters)