Endocrine System

• Endocrine system


  • A complex network of glands and organs
  • A messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs
• Pituitary gland


  • Plays an important role as a "controller"
  • Often referred to as the "master gland"
  • Secretes antidiuretic hormone (ADH)
• Thyroid gland


  • Secretes triiodothyronine (T3) and thyroxine (T4)
  • Regulates weight, energy levels, internal temperature, skin, hair, nail growth, metabolism
• Adrenal gland


  • Secretes adrenaline
  • Adrenaline triggers the body's fight-or-flight response
  • Plays a role in metabolism, attention, focus, panic and excitement
  • Abnormal levels of adrenaline are linked to sleep disorders, anxiety, hypertension and lowered immunity
• Pancreas


  • Secretes insulin and glucagon
  • Glucagon keeps blood glucose from dropping too low
  • Insulin is produced to keep blood glucose from rising too high
• Ovaries

  • Secrete estrogen and progesterone
  • Estrogen regulates the menstrual cycle
  • Progesterone prepares the body for pregnancy in the event that the released egg is fertilized
• Testicles


  • Secrete testosterone
  • Responsible for the development of male accessory sex organ
• Testicles

  • Regulate bone mass, fat distribution, muscle mass, and strength

  • Regulate spermatogenesis and libido in males
• Testosterone is an androgen that are produced in the testes
• Organs of Endocrine System

  1. Pituitary Gland
  2. Adrenal Gland
  3. Thyroid Gland
  4. Pancreas
  5. Ovaries
  6. Testicles