Adrenergic Agents

Question 0

Beta-2 receptors

Answer 0

Cause relaxation of smooth muscle. Only epinephrine has activity at beta-2. It causes bronchodilation urinary storage and vasodilation

Question 1

Alpha-1 receptors

Answer 1

Excitatory. Because contraction of smooth muscle everywhere but the G.I. system. Norepinephrine and epinephrine

Question 2

What happens if you stimulate alpha-1

Answer 2

Smooth muscle contraction eXcept GI SMOOTH muscle cells

Question 3

What happens if you stimulate beta-2

Answer 3

Smooth muscle relaxation

Question 4

beta-1

Answer 4

Only excitatory cardiac effects

Question 5

Talk about beta-1 FX at SA, AV node and ventricular cells

Answer 5

SA increase heart rate. AV increase speed of conduction. Ventricular increase contractility

Question 6

Norepinephrine and epinephrine stimulation for alpha one, beta-1, beta-2

Answer 6

Epinephrine and norepinephrine stimulate alpha-1 and beta-1 about equally. Norepinephrine has little effect at beta-2. Epinephrine very powerfully stimulates beta-2!!!!