ATI LPN
100 Questions on the Cardiovascular System PDF Questions
Question 1 of 5
Identify the thickest layer of the heart wall.
Correct Answer: C
Rationale: The myocardium is the thickest layer of the heart wall, consisting of cardiac muscle responsible for pumping.
Question 2 of 5
The layer of blood vessels consisting of an endothelial layer with a basement membrane is the tunica:
Correct Answer: C
Rationale: The tunica intima, or interna, is the innermost layer of blood vessels and consists of an endothelial lining and a basement membrane.
Question 3 of 5
Which of the following would cause blood pressure to decrease?
Correct Answer: D
Rationale: Atrial natriuretic factor (ANF) promotes vasodilation and sodium excretion, reducing blood volume and thus lowering blood pressure. The other options increase blood pressure.
Question 4 of 5
With age, the size of the heart typically and the resting heart rate
Correct Answer: D
Rationale: With age, the heart size increases due to hypertrophy, and resting heart rate decreases due to reduced pacemaker efficiency.
Question 5 of 5
Which of the following correctly lists the sequence of structures that a cardiac action potential follows in order to excite normal contraction of the heart?
Correct Answer: D
Rationale: The correct pathway is: SA node→ AV node→ Bundle of His→ Purkinje fibers, ensuring sequential depolarization and contraction of the heart chambers.