ATI RN
Cardiovascular System Test Questions Questions
Question 1 of 5
The volume of blood ejected from the left ventricle into the aorta each minute is called the
Correct Answer: A
Rationale: Cardiac output (A) is the volume ejected per minute (stroke volume × heart rate, ~5 L/min). Stroke volume (C) is per beat, heart rate (D) is beats per minute, and cardiac input (B) is not a term.
Question 2 of 5
The innermost layer of the heart
Correct Answer: C
Rationale: The endocardium (C) is the innermost layer, lining the heart chambers. Epicardium (A) is outer, myocardium (B) is muscle, pericardium (D) is the sac.
Question 3 of 5
Receptors that are sensitive to changes in pressure
Correct Answer: B
Rationale: Baroreceptors (B) detect pressure changes in blood vessels, regulating heart rate and pressure. Chemoreceptors (A) sense chemicals, others (C, D) are unrelated.
Question 4 of 5
Which of the following hormones stimulates proliferation of red blood cells in red bone marrow?
Correct Answer: A
Rationale: EPO (A) from kidneys stimulates RBC production. TPO (B) affects platelets, hGH (C) promotes growth, calcitonin (D) regulates calcium.
Question 5 of 5
Which of the following substances is an anticoagulant produced by mast cells and basophils?
Correct Answer: A
Rationale: Heparin (A) from mast cells/basophils inhibits clotting. Fibrinogen (B) forms clots, thromboxane A2 (C) promotes aggregation, prostacyclin (D) inhibits platelets.