Which of the following actions isare mediated by the adenyly

Which of the following actions is/are mediated by the adenylyl cyclase mechanism? Effect of epinephrine to increase cardiac contractility _____ Effect of epinephrine to increase heart rate _____ Effect of acetylcholine to decrease heart rate _____ Constriction of vascular smooth muscle in splenic blood vessels _____ What is the name of the enzyme responsible for the fact that the adrenal medulla synthesizes more epinephrine than norepinephrine? _____ In the action of the alpha-1 receptor, what is the correct order of steps: Alpha-q binds to GDP Alpha-q binds to GTP Generation of IP3 Release of Ca^2+ from intracellular stores Activation of protein kinase Activation of phospholipase-C Place the order here by writing the letter in the order from start to end of this signaling pathway: Input Yes in the blank for those that are mediated by muscarinic receptors and No for those that are not mediated by muscarinic receptors Slowing of conduction velocity in the atrial ventricular node of the heart: _____ Gastric acid secretion: _____ Erection: _____ Renin secretion: _____ Sweating on a hot day: _____

Solution

Answer :

Q5: option B

Q6. : phenylethanolamine N-methyltransferase.

Q7. e, f ,a , b. d, c

Q.8

a. Yes. The M₂ muscarinic receptors are located in the heart, where they act to slow the heart rate down to normal sinus rhythm after positive stimulatory actions of the parasympathetic nervous system, by slowing the speed of depolarization

b. Yes. gastric acid secretion is mediated by M(3) and M(5) but not M(1) muscarinic acetylcholine receptors in mice

c. Yes

d. No.

e. Yes.