21    V S 223  The  Endocrine  System
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21 V S 223 The Endocrine System

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    21    V S 223  The  Endocrine  System 21 V S 223 The Endocrine System Presentation Transcript

    • 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 ovulation in cats, rabbits
    • 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 –Catecholamines, T4 • Steroids – cholesterol derivatives –Gonadal hormones and adrenal cortical hormones
    • Mechanisms of Action • Hormones circulate in the bloodstream and bind with target organ cell receptors to affect a change in the target cell
    • Hydrophilic Hormones Peptides and Catecholamines
    • Lipophilic Hormones Steroids and Thyroid
    • Hormonal Action
    • Feedback Regulation