adrenergic and cholinergic receptor locations

Question 1

what receptors are in the eye? what do they do?

Answer 1

• a1: contracts dialator for pupil dialation; decreases aqueous humour
• a2: decreases aqueous humour thru decreased b2 activation
• b1/b1: increase aqueous humour
• M3: contract muslces to drain aqueous humour; pupil constriction.

Question 2

what receptors are in the heart? what do they do?

Answer 2

• b1: increase heart activity
• M2: decrease heart activity

Question 3

what receptors are in the blood vessels? what do they do?

Answer 3

• a1: vasocontriction
• b2: vasodialation

Question 4

what receptors are in the GI tract? what do they do?

Answer 4

• a1: contraction of muscle at sphincters for decreases motility
• a2: decrease ACh release for decreased motility
• b2: relaxes smooth muslcle for decreased motility
• M3: contracts smooth muscle for increased motility

Question 5

what receptors are in the bladder? what do they do?

Answer 5

• a1: contracts smooth muscle at sphincters for decrease urination
• b2: relaxes smooth muscle for decreased urination
• M3: contraction of smooth muscle for increased urination