A patient presents with periods of severe headaches and flushing however every time they have come to the physician they have not experienced any symptoms. The only abnormal finding is a blood pressure of 175 mmHg/100 mmHg. It is determined that the optimal treatment for this patient is surgical. Prior to surgery which of the following noncompetitive inhibitors should be administered?
APhentolamine
BIsoproterenol
CAtropine
DPropranolol
EPhenoxybenzamine
A 60-year-old man presents to the office for a scheduled follow-up visit. He has had hypertension for the past 30 years and his current anti-hypertensive medications include lisinopril (40 mg/day) and hydrochlorothiazide (50 mg/day). He follows most of the lifestyle modifications recommended by his physician, but is concerned about his occasional occipital headaches in the morning. His blood pressure is 160/98 mm Hg. The physician adds another drug to his regimen that acts centrally as an α2-adrenergic agonist. Which of the following second messengers is involved in the mechanism of action of this new drug?
ACalcium ions
BInositol triphosphate
CCyclic guanosine monophosphate
DCyclic adenosine monophosphate
EDiacylglycerol
A drug research team has synthesized a novel oral drug that acts as an agonist at multiple adrenergic receptors. When administered in animals, it has been shown to produce urinary retention at therapeutic doses with the absence of other manifestations of adrenergic stimulation. The researchers are interested in understanding signal transduction and molecular mechanisms behind the action of the novel drug. Which of the following receptors would most likely transduce signals across the plasma membrane following the administration of this novel drug?
AGoPCRs (Go protein-coupled receptors)
BGsPCRs (Gs protein-coupled receptors)
CGqPCRs (Gq protein-coupled receptors)
DGtPCRs (Gt protein-coupled receptors)
EGiPCRs (Gi protein-coupled receptors)
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