Human Anatomy and Physiology

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Presentation transcript:

Human Anatomy and Physiology Autonomic nervous system

ANS organization

SNS - ANS comparison

SNS - ANS comparisons

ANS organization Parasympathetic Sympathetic Cranial, S2 & S4 Ganglia close to organ Sympathetic T1 - L2 Ganglia far from organ paravertebral

Effects of divisions

Naming nerves of the ANS All preganglionic are cholinergic (Ach) Postganglionic neurons of parasympathetic are cholinergic (Ach) Postganglionic neurons of sympathetic are adrenergic (norepinepherine)

Cholinergic receptors Receptors that bind Ach Types: Nicotinic receptors Location Postganglionic neurons (symp. & parasymp.) Adrenal medulla cells Skeletal muscle cells Effect: always stimulatory

Cholinergic receptors Types: Muscarinic receptors Location All parasympathetic target organs Some sympathetic target organs (i.e., sweat glands) Effect: inhibitory or stimulatory

Adrenergic receptors Receptors that bind norepinephrine Classes: alpha and beta Alpha - generally stimulatory Except for digestion Beta - generally inhibitory Except for heart

ANS control

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