sympathoadrenal system - imbm...2017/03/07 · sympathoadrenal system mgr. emese renczés, phd....
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Adrenal glands - anatomy
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Autonomic nervous
system
• Afferent
• Central
• Efferent
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Biosynthesis
of catecholamines
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Secretion and metabolism
• Fight or flight response
• Depolarization of membranes
• Increase of intracellular Ca2+
• physical activity, stress stimuli, hemorrhage, hypoclycemia, hypoxia
• Metabolism: monoamine oxidase, catechol-O-methyltransferase
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Cholinergic receptors
https://www.youtube.com/watch?v=EChrlp4a-f4
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Mechanism of action
https://www.youtube.com/watch?v=ejq99wLEMTw https://www.youtube.com/watch?v=VrwpCitPRbE https://www.youtube.com/watch?v=5zzE35tzRyQ https://www.youtube.com/watch?v=moY8UefNlAw
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Biological effects
• Liver – glycogenolysis, gluconeogenesis (α) • Muscle – glycogenolysis, glycolysis (β2) • Adipose – lipolysis (β1) • Pancreas – inhibited secretion of insulin (α2) • Vasoconstriction – skin, mucous membranes, splanchnic
organs, kidney • Vasodilatation – skeletal muscles • Inotropic, chronotropic, dromotropic, bathmotropic (β1) • Increase blood pressure • Bronchodilatation (β2) • Mydriasis (α1) • Inhibit the motility of GIT
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Pheochromocytoma
• 90% - adenoma
• Excess of adrenalin and noradrenalin
• Hypertension (paroxysmal, persistent)
• Palpitations, tachycardia, hyperglycemia
• Complications
▫ Stroke, nephropathy, retinopathy, ischemic heart disease
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