ATI LPN
100 Questions on the Cardiovascular System Questions
Question 1 of 5
What is the resting membrane potential of the sinus nodal fibers?
Correct Answer: B
Rationale: The resting membrane potential of sinus nodal fibers is approximately -55 mV (assuming a typo in options; corrected to -55 mV).
Question 2 of 5
Camouflages the bacterium and hide it:
Correct Answer: B
Rationale: The hyaluronic acid capsule mimics host tissue, camouflaging Streptococcus pyogenes.
Question 3 of 5
A 31-year-old female presented with fever, intermittent severe pain in the left upper quadrant of the abdomen, and painful lesions involving her fingers and nail beds. History reveals that she had acute rheumatic fever attack as a child and that when she was around 20 years of age she developed a new cardiac murmur. At the present time one of three blood cultures submitted to the hospital lab grows out a particular organism. Which one of the following is the most likely organism?
Correct Answer: B
Rationale: Viridans streptococci are common in subacute endocarditis on rheumatic-damaged valves.
Question 4 of 5
Which one of the following drugs has potassium-sparing effect?
Correct Answer: A
Rationale: Spironolactone is a potassium-sparing diuretic.
Question 5 of 5
A patient with severe hypertension was treated with a combination of hydralazine, hydrochlorothiazide, and metoprolol. Which one of the following may happen as a side effect?
Correct Answer: D
Rationale: Hydralazine can cause a lupus-like syndrome.