How does thyroid work?Hypothalamus – Pituitary – Thyroid axis works like Boss – Manager – Worker:
- Hypothalamus releases “thyrotropin-releasing hormone(TRH)”, stimulates the Pituitary. — the boss asks the manager to work.
- Pituitary then release “thyroid-stimulating hormone (TSH)”, stimulates the Thyroid. — the manager asks the worker to work.
- Thyroid then release “triiodothyronine (T3)” and “thyroxine (T4)”. — the workers start to work.
- When the T3 and T4 level raise, it suppresses the Pituitary and Hypothalamus to release TSH and TRH. — when the Boss and manager saw the workers working, they'll stop pushing them.
What does thyroid hormones mainly do?
- It accelerates metabolism.
- It promotes growth and development, especially brain, nerve system and bones.
- Excites the nerve system.
- Increases heart rate.
- Increase appetite and bowel movement.