During a Cardiovascular Examination,a Patient Has a Resting Heart Rate

question 4

Multiple Choice

During a cardiovascular examination,a patient has a resting heart rate of 65 beats/minute and a blood pressure of 100/70 mm Hg in the supine position.In the upright position at steady state,the patient's heart rate is 74 beats/minute,and the blood pressure is 105/70 mm Hg. Agents that increase intracellular cyclic adenosine monophosphate (cAMP) ,such as β-adrenergic agonists,have a potent vasodilator effect by:

• A)Increasing nitric oxide production in smooth muscle.
• B)Stimulating guanylate cyclase activity in endothelial cells.
• C)Reducing myosin light-chain kinase (MLCK)activity.
• D)Suppressing calcium entry into smooth muscle cells.
• E)Reducing the synthesis of guanosine monophosphate (cGMP)in smooth muscle

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