Adrenergic receptors and locations

Question 1

alpha1

Answer 1

vasoconstriction (contraction of vasc sm musc)

relaxation of intestinal sm muscle

Question 2

alpha2

Answer 2

decreased NE release at pre-synaptic nerve terminal

contraction of vascular sm muscle (vasoconstriction- slight)

Question 3

beta1

Answer 3

acts on heart (SA node) to increase force (isotropy) and rate of contraction (chronotropy)
- increases AV nodal conduction velocity

Question 4

beta2

Answer 4

relaxes smooth muscle (vascular, bronchioles, GI, GU)