A 29-year-old man comes to the physician for a 2-month history of episodic pounding headaches and palpitations. He has no past medical history. He works in construction. His 34-year-old brother had a thyroid tumor removed 8 years ago. Laboratory testing of the urine is performed, followed by an abdominal CT that confirms the diagnosis. Surgery is planned, and an irreversible pharmacologic agent is administered. Which of the following is most likely true of this pharmacologic agent?
Decreases IP3
Decreases cAMP
Decreases cAMP
Decreases cGMP
Increases IP3
Increases cAMP
Increases cAMP
Increases cGMP
