Hormonal coordination in humans

• Give the name of the bodies coordination system which involves hormones

  The endocrine system
• What is a hormone

  It’s a chemical messenger secreted by a gland. It travels in the blood to a target organ, where it causes a response.
• What type of organ secrets hormones

  Glands
• Which gland controls many other glands in the body?

  The pituitary gland
• Why’s the pituitary gland considered a master gland

  It secretes a wide range of hormones, some which may stimulate other endocrine glands
• What’s the role of the pituitary gland in the endocrine system

  • Secretes human growth hormone- controls human growth
  • stimulates the thyroid gland
  • stimulates ovulation and the production of oestrogen in the ovaries
  • stimulates the production of sperm and testosterone in the testes
• What’s the role of the thyroid gland in the endocrine system

  Secretes the hormone thyroxine- controls metabolism,heart rate and body temperature
• What’s the role of the pancreas’s in the endocrine system

  Secretes the hormone insulin- controls blood glucose levels
• What’s the role of the adrenal gland in the endocrine system

  Secretes adrenaline- controls the body’s fight or flight response
• What the role of the ovaries in the endocrine system

  Secrete oestrogen which coordinates the menstrual cycle and the development of female secondary sexual characteristics
• Whats the role of the testes in the endocrine system 


  Secretes testosterone which coordinates the production of sperm and the development of male secondary sexual characteristics
• Which organ monitors and controls blood glucose concentration

  The pancreas
• How does the pancreas respond when blood glucose levels are too high

  It secretes the hormone insulin, the insulin binds to receptors on the liver and muscles causing excess glucose to be converted into glycogen and stored
• How does the pancreas respond when blood glucose levels are too low

  The pancreas secretes the hormone glucagon. Glucagon binds to liver cells causing glycogen to be converted into glucose and released into the blood.
• How is blood glucose concentration controlled using a negative feedback loop

  • When the blood glucose concentration rises or falls below the optimum a hormone is secreted by the pancreas
  • the action is either hormone (insulin or glucagon) helps bring back the concentration to the correct level