ATI LPN
Cardiovascular System Questions Questions
Question 1 of 9
What is the natural pacemaker of the heart?
Correct Answer: B
Rationale: The SA node is the natural pacemaker, initiating the heartbeat.
Question 2 of 9
Streptokinase is a bacterial protein produced by:
Correct Answer: B
Rationale: Streptokinase is produced by beta-hemolytic streptococci, particularly Streptococcus pyogenes.
Question 3 of 9
What action by the AP will require the nurse to intervene when taking the blood pressure of an obese patient admitted with heart failure?
Correct Answer: B
Rationale: The cuff should be deflated at a rate of 2 to 3 mm Hg/sec. The arm should be supported at the level of the heart for accurate blood pressure measurements.
Question 4 of 9
In response to a decrease in blood pressure, heart rate will_____ and the arterioles will______.
Correct Answer: D
Rationale: In response to decreased blood pressure, the cardiovascular system increases heart rate and constricts arterioles to raise blood pressure.
Question 5 of 9
The free radical nitric oxide is generated in cells by reaction catalyzed by:
Correct Answer: B
Rationale: Nitric oxide synthase (NOS) catalyzes the production of nitric oxide.
Question 6 of 9
A corrective cardiac procedure in which a large piece of a patient's own latissimus dorsi muscle is wrapped around the heart and stimulated by an implanted pacemaker to assist the pumping action of a damaged heart.
Correct Answer: D
Rationale: Cardiomyoplasty is the described procedure; the others are conditions, not surgical interventions.
Question 7 of 9
A patient has a history of heart failure. Which of the following statements by the patient indicates they may be experiencing heart failure exacerbation?
Correct Answer: D
Rationale: Weight gain of 6 lbs in a week (A) and orthopnea (B) are signs of heart failure exacerbation due to fluid retention and pulmonary congestion. Lack of swelling (C) does not indicate exacerbation.
Question 8 of 9
Why is atherosclerosis especially dangerous when found in coronary arteries?
Correct Answer: D
Rationale: Atherosclerosis is a disease of the arteries characterised by the deposition of fatty material on their inner walls that can lead to a heart attack, restrict blood flow to the heart muscle, and lead to coronary heart disease.
Question 9 of 9
Which of the following type of muscle contains the largest number of mitochondria per cell?
Correct Answer: C
Rationale: Cardiac muscle cells have the highest mitochondrial density among muscle types, reflecting their high energy demands and constant activity.