The endocrine system is made up of seven different glands (groups of cells) that make chemicals called hormones. Hormones are substances that act as "messengers" to control many body functions. The endocrine system makes more than 20 major hormones that help control:

  • Growth
  • Reproduction
  • Sexual development
  • Use and storage of energy
  • Response to physical stress or trauma
  • Levels of fluid, salt and sugar in the blood