ATI LPN
100 Questions on the Cardiovascular System Questions
Question 1 of 5
Coronary vessels are found in:
Correct Answer: B
Rationale: Coronary vessels are primarily located in the epicardium, supplying blood to the myocardium.
Question 2 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 3 of 5
HMG CoA reductase is present in:
Correct Answer: A
Rationale: HMG CoA reductase is located in the endoplasmic reticulum membrane, key to cholesterol synthesis.
Question 4 of 5
Camouflages the bacterium and hide it:
Correct Answer: B
Rationale: The hyaluronic acid capsule mimics host tissue, camouflaging Streptococcus pyogenes.
Question 5 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.