Adrenaline and thyroxine

• Where does adrenaline come from?

  The adrenal glands (above the kidneys)
• Why is adrenaline released?

  In response to stressful or scary situations your brain detect stress and sends nervous impulses to the adrenal gland that respond by secreting adrenaline
• What does adrenaline do?

  It triggers mechanisms that increases supply of oxygen and glucose to cells in the brain and muscles
• How does your body control the levels of hormones in the blood?

  By using negative feedback systems
• where is thyroxine released from?

  The thyroid gland
• Why is thyroxine important?

  It helps regulate the basal metabolic rate and stimulates protein synthesis for growth and development
• What is the basal metabolic rate?

  The speed that chemical reactions in the body occur while the body is at rest
• What happens if the blood thyroxine level is too high?

  The secretion of TSH from the pituitary gland is inhibited (stopped) which reduces the amount of thyroxine release from the thyroid gland, so the level falls back to normal
• When secreted from the pituitary does THS increase or decrease the amount of thyroxine released?

  Increase
• What is TSH?

  Thyroid stimulating hormone