Across
- 4. The process that breaks down food physically and chemically
- 5. Protection against a disease or condition
- 9. The burning of food for heat and energy by cells
- 11. A very tiny blood vessel
- 12. A group of cells with similar function
- 14. The substance in red blood cells that provides oxygen
- 15. The lining of the uterus is discharged
Down
- 1. A blood vessel that returns blood to the heart
- 2. The point at which 2 or more bones meet together
- 3. Process of supplying cells with oxygen
- 6. A chemical substance secreted by endocrine glands
- 7. Organs that work together to perform special function
- 8. Groups of tissue with the same function
- 10. A blood vessel that carries blood away from heart
- 11. The basic unit of body structure
- 13. Involuntary muscle contractions in the digestive system