ATI RN
Cardiovascular System Assessment Questions Questions
Question 1 of 5
The glycoprotein hormone that stimulates the formation of red blood cells
Correct Answer: B
Rationale: Erythropoietin (B) from kidneys boosts RBC production.
Question 2 of 5
Closer to the heart, arteries would be expected to have a higher percentage of
Correct Answer: C
Rationale: Elastic arteries (e.g., aorta) near the heart have more elastic fibers (C) for stretch/recoil during systole. Endothelium (A) is a thin layer, smooth muscle (B) dominates in muscular arteries, collagen (D) supports.
Question 3 of 5
Arteries serving the stomach, pancreas, and liver all branch from the
Correct Answer: C
Rationale: The celiac trunk (C) supplies the stomach, pancreas, and liver. Mesenteric arteries (A, B) serve intestines, splenic (D) is a branch of celiac.
Question 4 of 5
The influx of which ion accounts for the plateau phase?
Correct Answer: D
Rationale: Calcium (D) influx via L-type channels sustains the plateau phase in cardiac action potentials.
Question 5 of 5
The two tubes that eventually fuse to form the heart are referred to as the
Correct Answer: B
Rationale: Endocardial tubes (B) fuse to form the primitive heart tube in the embryo.