Question 19.19. A nurse practitioner has ordered the measurement of a cardiac patient's electrolyte levels as part of the patient's morning blood work. Which of the following statements best captures the importance of potassium in the normal electrical function of the patient's heart? (Points : 3) The selective permeability of cell membranes to potassium, and its near-impermeability to sodium ions, produces the resting membrane potential of cardiac cells. Potassium does not catalyze the metabolism of ATP, and sodium and potassium ions do not move across the cell membrane in a 1:1 ratio.Potassium catalyzes the metabolism of ATP, producing the gradient that results in electrical stimulation.Potassium is central to establishing and maintaining the resting membrane potential of cardiac muscle cells.The impermeability of cardiac cell membranes to potassium allows for action potentials achieved by the flow of sodium ions.
The reciprocal movement of one potassium ion for one sodium ion across the cell membrane results in the production of an action potential. Question 20.20. In which of the following patient situations would a nurse practitioner be most justified in preliminarily ruling out pericarditis as acontributing pathology to the patient's health problems? (Points : 3) Question 21.21. During a routine physical examination of a 66-year-old woman, her nurse practitioner notes a pulsating abdominal mass and refers the woman for further treatment. The nurse practitioner is explaining the diagnosis to the patient, who is unfamiliar with aneurysms. Which of the following aspects of the pathophysiology of aneurysms would underlie the explanation the nurse provides? (Points : 3) Hypertension is associated with over half of aneurysms. They are not consequences of
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- Summer '19