Drug Y Is a Drug That Is Used to Increase

question 20

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

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