Drug Y Is a Drug That Is Used to Increase

Multiple Choice

Drug Y is a drug that is used to increase the force of contraction achieved by heart muscle tissue.In the absence of the drug,epinephrine increases heart contractility through a signaling pathway that involves a receptor and cAMP.Which of the following are plausible mechanisms of action for Y?

A) Acting as an agonist on the receptor for epinephrine,a hormone that increases heart contractility
B) Increasing the expression of cAMP
C) Inhibiting phosphodiesterase activity
D) Increasing the availability of phosphodiesterase molecules
E) Decreasing the activity of cAMP-dependent protein kinase