ATI RN
NCLEX Practice Questions Cardiovascular System Questions
Question 1 of 5
Identify the pouch-like structure that increases the total filling capacity of the atrium.
Correct Answer: D
Rationale: The auricle is a pouch-like extension of the atrium, increasing its capacity. Ventricle (A) is a chamber, coronary sulcus (B) is a groove, fossa ovalis (C) is a fetal remnant, and interatrial septum (D) divides atria.
Question 2 of 5
If the sinoatrial node is setting the pace for the heartbeat, it will usually be:
Correct Answer: B
Rationale: The SA node typically sets a resting rate of 70-75 bpm (B) under vagal tone, though its intrinsic rate is ~100 bpm.
Question 3 of 5
Another name for the left AV valve
Correct Answer: B
Rationale: The left AV valve is the mitral valve (B), also called bicuspid. Tricuspid (A) is right AV, pulmonary (C) and aortic (D) are semilunar.
Question 4 of 5
Contraction of vascular muscle that increases resistance to blood flow
Correct Answer: B
Rationale: Vasoconstriction (B) contracts vascular muscle, increasing resistance. Vasodilation (A) decreases it, others (C, D) are cardiac terms.
Question 5 of 5
Ferritin is a protein used to
Correct Answer: B
Rationale: Ferritin (B) stores iron in the liver and other tissues. Transferrin (A) transports iron, oxidation (C) and synthesis (D) are incorrect.