Receptors in ANS:
Cholinergic:
• two main types of acetylcholine receptors:
• Nicotinic receptors (effect of binding is stimulatory)
• nicotinicN – located on all autonomic ganglia and on adrenal medulla ganglionic transmission
• nicotinicM – at neuromuscular junction skeletal muscle contraction
• Muscarnic receptors (effect is stimulatory or inhibitory – depends on organ)
Adrenergic:
two main types of norepinephrine receptors:
alpha
alpha-1 (located on blood vessels of skin constriction, kidney’s, abdominal viscera, salivary glands)
alpha-2 (located in membrane of adrenergic axon terminals; function to inhibit transmitter release)
beta
beta-1 (located mainly in heart increases rate, force of contraction and increased AV conduction velocity; also in kidneys renin release)
beta-2 (located in bronchi dilation; blood vessels supplying skeletal muscles and heart dilation; liver glycogenolysis)
beta-3 (located in adipose tissue)
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