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