ATI LPN
100 Questions on the Cardiovascular System Questions
Question 1 of 5
What is meant by the concept 'venous return mechanism'?
Correct Answer: A
Rationale: Venous return refers to blood movement back to the heart, facilitated by muscular activity and vessel mechanisms.
Question 2 of 5
An increase in left atrial pressure is most likely to occur in which of the following heart murmurs?
Correct Answer: C
Rationale: Mitral regurgitation causes blood to flow back into the left atrium, increasing its pressure.
Question 3 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 4 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 5 of 5
Camouflages the bacterium and hide it:
Correct Answer: B
Rationale: The hyaluronic acid capsule mimics host tissue, camouflaging Streptococcus pyogenes.