A1/A2/B1/B2 receptors

Question 1

A1 receptors

Answer 1

• Vasoconstriction of blood vessels going to skin, GI tract, and kidneys.
• Contraction of arrector pili, uterus, ureters, internal urethral sphincters

Question 2

A2 receptors

Answer 2

• Inhibit insulin secretion from pancreas
• Contraction of GI tract sphincters

Question 3

B2 receptors

Answer 3

• Vasodilation of blood vessels going to heart, liver, and skeletal muscle.
• Bronchidilation in lungs
• Relaxation of uterus, GI tract, and urinary bladder

Question 4

B1 receptors

Answer 4

• Increased HR and contractility
• Stimulate renin secretion from kidneys