The functions of thyroid hormones are:
1. Production of energy by maintaining the Basal Metabolic Rate (BMR) of the body.
2. Helps to maintain normal body temperature.
3. Influences the activity of the central nervous system.
4. Controls growth of the body and bone formation and development of gonads.
5. Essential for normal physical, mental and personality development. It is also known as personality hormone.
6. Regulates cell metabolism.
7. Increases oxygen consumption in tissues.