ATI RN
Cardiovascular System Quiz Questions Questions
Question 1 of 5
The blood vessels that are under the greatest pressure are:
Correct Answer: A
Rationale: Large arteries (e.g., aorta) experience the highest pressure (around 120 mmHg systolic) directly from ventricular ejection. Pressure decreases progressively in small arteries, capillaries (around 35 mmHg), and veins (near 0 mmHg).
Question 2 of 5
Which of the following carry deoxygenated blood from the right atrium to the lungs?
Correct Answer: C
Rationale: The pulmonary arteries carry deoxygenated blood from the right ventricle (after passing through the right atrium) to the lungs for oxygenation. Pulmonary veins carry oxygenated blood back to the left atrium, the aorta carries oxygenated blood systemically, and the superior vena cava delivers deoxygenated blood to the right atrium.
Question 3 of 5
Bob has a hemoglobin measurement of 15 g per 100 mL (or 1 dL) of blood. This is:
Correct Answer: A
Rationale: Normal hemoglobin levels are 13.5-17.5 g/dL for men and 12-15.5 g/dL for women. Assuming Bob is male (typical default in such questions), 15 g/dL is within normal limits; if female, it’s still normal.
Question 4 of 5
Leukocytes and platelets compose about what fraction of the blood volume?
Correct Answer: A
Rationale: Leukocytes and platelets form ~1% of blood volume; RBCs (formed elements) are ~45%, and plasma is ~55%. The combined fraction is small due to their low numbers relative to RBCs.
Question 5 of 5
This about second heart sound is incorrect
Correct Answer: D
Rationale: The second heart sound (S₂) results from semilunar valve closure (aortic and pulmonary) at the start of diastole and can split due to asynchronous closure (A and C are true). S₁ (AV valve closure) is longer and lower-pitched (~0.14s) than S₂ (~0.11s), making D incorrect as S₂ is shorter, not longer.