Refer to the figure below, showing the enzyme cAMP-dependent phosphodiesterase converting cAMP to AMP.Chemical compounds that inhibit this enzyme are used as drugs to stimulate heart rate in patients with weak hearts. 
Which biological function does the nucleotide cAMP provide in this instance?
Definitions:
Interest Rate
The percentage of principal charged by the lender for the use of its money.
Budget Constraint
An economic model that outlines the combination of goods and services a consumer can purchase given their income and the prices of those goods and services.
Consumption
is the act of using goods and services to satisfy needs or desires, often discussed in the context of consumer behavior in economics.
Earnings
The amount of money received by an individual or organization in return for labor or services provided, or from investments.
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