Thyroxine

• Thyroid gland


  Uses iodine from diet to produce thyroxine
• Thyroxine controls the basal metabolic rate of bodies
• Thyroxine


  • Controls the rate of which substances are broken down/built up
  • Controls how much energy tissues use
  • Controls the development of the brain in a child
• Thyroxine


  Plays an important part in growth and development
• In adults, the level of thyroxine in the blood is relatively stable
• This is a result of negative feedback
• Low levels of thyroxine detected by sensors in the brain

  TSH increases
• TSH increases


  Stimulates production of thyroxine by the thyroid gland