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The Endocrine System

       VS 223
      Dr. Noland
Endocrine Glands
• Secrete their product directly
  into bloodstream
• Known as “ductless” glands
Hormones
• Act on target organs due to specific
  receptors located on the target
  plasma membrane
Neuroendocrine Reflex
• Nerve input on the afferent end
• Hormonal input on the efferent end

• Suckling reflex
• Induced ...
Endocrine Glands
• Discrete gland - Adrenal gland

• Organ – Duodenum

• Combo of Exocrine/Endocrine -
  Pancreas
Classification of Hormones
• Peptides – chains of amino acids
       –Most hormones
• Amines – tyrosine derivatives
      ...
Mechanisms of Action
• Hormones circulate in the
  bloodstream and bind with
  target organ cell receptors to
  affect a c...
Hydrophilic
Hormones
 Peptides and
Catecholamines
Lipophilic Hormones
 Steroids and Thyroid
Hormonal
 Action
Feedback Regulation
21    V S 223  The  Endocrine  System
21    V S 223  The  Endocrine  System
21    V S 223  The  Endocrine  System
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21 V S 223 The Endocrine System

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Transcript of "21 V S 223 The Endocrine System"

  1. 1. The Endocrine System VS 223 Dr. Noland
  2. 2. Endocrine Glands • Secrete their product directly into bloodstream • Known as “ductless” glands
  3. 3. Hormones • Act on target organs due to specific receptors located on the target plasma membrane
  4. 4. Neuroendocrine Reflex • Nerve input on the afferent end • Hormonal input on the efferent end • Suckling reflex • Induced ovulation in cats, rabbits
  5. 5. Endocrine Glands • Discrete gland - Adrenal gland • Organ – Duodenum • Combo of Exocrine/Endocrine - Pancreas
  6. 6. Classification of Hormones • Peptides – chains of amino acids –Most hormones • Amines – tyrosine derivatives –Catecholamines, T4 • Steroids – cholesterol derivatives –Gonadal hormones and adrenal cortical hormones
  7. 7. Mechanisms of Action • Hormones circulate in the bloodstream and bind with target organ cell receptors to affect a change in the target cell
  8. 8. Hydrophilic Hormones Peptides and Catecholamines
  9. 9. Lipophilic Hormones Steroids and Thyroid
  10. 10. Hormonal Action
  11. 11. Feedback Regulation
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