Across
- 4. This system breaks down food and turns it into energy
- 5. The immune system fights these microorganisms that cause disease
- 6. This organ is where most of the nutrients are absorbed from the food you eat
- 9. The largest bone in the human body
- 10. This glad of the endocrine system produces the hormone melatonin
- 11. This organ holds urine until it's ready to come out
- 12. This system is made up of bones, joints, and ligaments
- 14. These grape-like sacs in the lungs are where gas exchange (O2 and CO2) occurs
- 15. This organ contains hydrochloric acid to help kill bacteria and break down food
Down
- 1. These organs filter the blood and remove waste and water to produce urine
- 2. This nervous system structure travels through the center of vertebral bones
- 3. This system contains your largest organ
- 7. This muscular organ works 24/7 to pump blood throughout your body
- 8. These structures attach muscles to bones
- 11. This liquid substance delivers oxygen and nutrients through vessels and removes waste
- 13. This organ contains more synaptic connections than the stars in the Milky Way