Receptors

Question 1

α1

Answer 1

• Action : Smooth muscle contraction

- Causes: Vasoconstriction, Mydriasis

Question 2

α2

Answer 2

-Action: Inhibits NE release
-Causes: Lower CNS response
-Location: Sited in pre-junction of synapse
-Other:
α2 + sedative (eg Xylazine) stops NE release
Relaxes GIT – used in rectal exams
Inhibits insulin release – raises blood glu levels
Vasoconsriction

Question 3

β1

Answer 3

-Action: Acts on cardiac muscle
-Causes:
Positive inotropic – more contraction
Positive chronotropic – leads to tachycardia

Question 4

β2

Answer 4

-Action: 	
Vasodilation – (Agonist = Clanbutyrol) 
Bronchodilation
Uterus relaxation
Liver GNG, GGL

Question 5

β3

Answer 5

-Causes: Lipolysis in fat tissue, but of much lesser importance