Endocrine System

• Stimulus-Response Mechanism

  1. Stimulus
  2. Receptor
  3. Control Centre
  4. Effector
  5. Response
• Endocrine Organs and Glands

  A) Pituitary Gland

  B) Hypothalamus

  C) Pineal Gland

  D) Parathyroid

  E) Thyroid

  F) Thymus

  G) Pancreas

  H) Ovaries

  I) Adrenal Glands

  J) Testes

  
• Homeostasis


  Condition of a relatively stable internal environment maintained within narrow limits
• Hormones


  Chemical messengers, released by endocrine glands, that regulate the function of distant organs, each with a specific receptor for its hormones.
• Negative Feedback Loop


  A regulatory mechanism in which a stimulus results in a response that is opposite in direction to that of the stimulus.
• Positive Feedback Loop


  A process in which the response to a stimulus causes an amplification of the initial change, increasing its level further away from the starting value.
• Endocrine System


  System of ductless glands that produce hormones and release them directly into the bloodstream