adrenaline and thyroxine

• What hormone is produced by the adrenal glands?


  Adrenaline
• When is adrenaline produced in the body?

  During the 'fight or flight' response
• What is the primary function of adrenaline?

  To prepare the body for activity
• What effect does adrenaline have on heart rate?

  It increases heart rate
• How does adrenaline affect blood pressure?

  It increases blood pressure
• What happens to blood flow to muscles when adrenaline is released?

  It increases blood flow to muscles
• How does adrenaline affect blood sugar levels?

  It increases blood sugar levels by stimulating the liver to break glycogen down into glucose
• What gland produces thyroxine?

  The thyroid gland
• What is the main role of thyroxine in the body?

  To increase metabolic rate
• What hormone does the pituitary gland produce to stimulate the thyroid gland?

  Thyroid Stimulating Hormone (TSH)
• What effect does thyroxine have on TSH production?

  Thyroxine inhibits the production of TSH from the pituitary gland
• What happens if thyroxine levels are too low?

  The pituitary gland will release TSH to stimulate more thyroxine production
• What occurs if thyroxine levels are too high?

  Thyroxine inhibits TSH production, leading to less thyroxine release
• What is the negative feedback mechanism in the regulation of thyroxine levels?

  • If thyroxine levels rise too high, it lowers TSH production.
  • If thyroxine levels fall too low, it increases TSH production.
  • This maintains thyroxine levels within a normal range.
• What is the role of the hypothalamus in the regulation of thyroxine levels?

  The hypothalamus helps regulate thyroxine levels through its influence on the pituitary gland