True or False: All of the following are functions of the digestive system.
1. Ingestion
2. Mastication
3. Propulsion
4. Mixing
6. Secretion
7. Digestion
8. Absorption
9. Elimination of waste
10. Secretion of growth hormone
11. Regulation of the sleep-wake cycle
12. Controls the timing of puberty
13. Regulates metabolic rate