Receptor type Major Functions

Question 1

alpha1

Answer 1

Increase: vascular smooth muscle contraction, pupillary dilator muscle contraction (mydriasis), intestinal and bladder sphincter muscle contraction

Question 2

alpha2

Answer 2

Decrease: sympathetic outflow, insulin release, lipolysis,
Increase: platelet aggregation

Question 3

beta1

Answer 3

Increase: heart rate, contractility, renin release, lipolysis

Question 4

beta2

Answer 4

Increase: vasodilation, bronchodilation, HR, contractility, lipolysis, insulin release, aqueous humor production, ciliary muscle relaxation
Decrease: Uterine tone (tocolysis)

Question 5

M1

Answer 5

CNS, enteric nervous sytem

Question 6

M2

Answer 6

Decrease: HR and atria contractility

Question 7

M3

Answer 7

Increase: exocrine gland secretions (lacrimal, salivary, gastric acid), gut peristalsis, bladder contraction, bronchoconstriction, pupillary sphincter contraction (miosi), ciliary muscle contraction (accommodation)

Question 8

D1

Answer 8

Relaxes renal vascular smooth muscle

Question 9

D2

Answer 9

Modulates transmitter release, especially in brain

Question 10

H1

Answer 10

Increase: Nasal and bronchial mucus production, vascular permeability, contraction of bronchioles, pruritus, and pain

Question 11

H2

Answer 11

Increase: gastric acid secretion

Question 12

V1

Answer 12

Increase vascular smoohtt muscle contraction

Question 13

V2

Answer 13

Increase H2O permeability and reabsorption in the collecting tubules of the kidney