ATI LPN
Cardiovascular NCLEX Questions with Rationale Questions
Question 1 of 5
The Frank-Starling mechanism:
Correct Answer: C
Rationale: The Frank-Starling mechanism correlates the stretch of cardiac muscle fibers with the strength of contraction.
Question 2 of 5
According to the Frank-Starling law, stroke volume increases as a function of:
Correct Answer: C
Rationale: Frank-Starling law states that the stroke volume of the heart increases in response to an increase in the volume of blood filling the heart (the end diastolic volume) when all other factors remain constant.
Question 3 of 5
Which of the following is NOT supplied by the Circle of Willis?
Correct Answer: A
Rationale: The Circle of Willis supplies the brain and parts of the eyes, but not the nose or pharynx, which have separate vascular supplies.
Question 4 of 5
If the Purkinje fibers, situated distal to the AV junction, become the pacemaker of the heart, what is the expected heart rate?
Correct Answer: A
Rationale: Purkinje fibers as pacemakers produce a rate of 20-40 beats/min, with 30/min being typical.
Question 5 of 5
Which of the following substances in plasma is the major factor that contributes to plasma colloid osmotic pressure?
Correct Answer: C
Rationale: Albumin is the primary contributor to plasma colloid osmotic pressure due to its abundance and size.