ANS Pharm Flashcards
What are the two types of parasympathetic ANS receptors?
muscarinic (M) and nicotinic (N)
What are the agonists for muscarinic cholinoceptors?
Acetylcholine, Bethanechol, and Pilocarpine
What antagonist suppresses all parasympathetic signals to M and N receptors?
Atropine
What suppresses signals to muscarinic receptors?
Scopolamine
What tissues are innervated by M1 receptors?
Stomach (increase acid secretion)
What tissues are innervated by M2 receptors?
Heart
What effects do M2 receptors elicit on the heart?
- decrease HR via SA node- decrease AP duration and contractility of atria- decrease conduction velocity via AV node- decrease contractility of ventricle
What tissues do M3 receptors innervate?
GI tract, secretory gland, eye, cardiac vessels, respiratory tract
What effects do M3 receptors elicit on the GI tract?
Contracts GI walls
What effects do M3 receptors elicit on the secretory glands?
Increase secretions
What effects do M3 receptors elicit on the eyes?
Constricts pupil via iris circular muscle
What do M3 receptors do for the heart?
Activation of EDRF release to vasodilate cardiac vessels
What effect do M3 receptors have on the respiratory tract?
Bronchoconstrict
What neurotransmitter do Nicotinic receptors use?
Acetylcholine
What do Nm receptors innervate?
They innervate muscle via neuromuscular junctions
What do Nn receptors innervate?
- autonomic ganglia in sympathetic chain and distance parasympathetic ganglia- adrenal medulla (release of catecholamines)
What are the three biggest types of sympathetic ANS receptors?
alpha, beta, D (for dopamine-receptor)
What tissues do alpha1 receptors innervate?
Eye, GI sphincters, Genitourinary (GU) sphincters, and blood vessels