21 v s 223 the endocrine system
TRANSCRIPT
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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 HormonesPeptides and
Catecholamines
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Lipophilic HormonesSteroids and Thyroid
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Hormonal Action
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Feedback Regulation