hormonal control of metabolic rate

• Adrenalin:

  • Increases heart rate

  • Constricts some blood vessels to increase blood pressure

  • Dilates other vessels to increase blood flow to muscles

  • Liver converts glucagon into glucose releasing it into the blood
• 1. Low levels of thyroxine stimulates production of TRH in hypothalamus.
  2. This causes the release of TSH from pituitary.
  3. TSH acts on thyroid to produce thyroxine.
  4. When thyroxine levels are normal, thyroxine inhibits release of TRH and production of TSH.
• Negative feedback is important for maintaining homeostasis in the body by regulating hormone levels and preventing overproduction or underproduction of hormones, which can lead to health problems.