endocrine system

• • system which sends messages around the body by glands and hormones (slower than the CNS & PNS)
  • helps to co-ordinate complex psychological reactions
  • endocrine glands secrete hormones into the blood stream
  • hormones are chemical substances that help regulate bodily activities
• PINEAL GLAND:

  • releases melatonin
  • regulates sleep-wake cycle
  • responsible for jetlag
• PITUITARY GLAND:

  • 'master gland'
  • sends messages to all other glands
  • sends messages to hormones to regulate all other glands
• THYROID:

  • releases thyroxine
  • controls metabolism
  • controls energy, fatigue, attention, weight
• ADRENAL GLANDS:

  • releases adrenaline
  • epinephrine, cortisol
  • fight or flight response
• PANCREAS

  • releases insulin/ glucagon
  • regulates blood sugar levels
• TESTES:

  • releases testosterone
  • growth, puberty and aggression
• OVARIES:

  • releases oestrogen
  • growth, development and aggression