ATI RN
Questions About the Cardiovascular System Questions
Question 1 of 5
The blood in the mammalian heart pumped by the right ventricle to the pulmonary artery passes through the:
Correct Answer: C
Rationale: Blood from the right ventricle exits via the pulmonary valve (C) to the pulmonary artery. Tricuspid (A) is inflow, bicuspid (B) is left-sided, and aortic arch (D) is systemic.
Question 2 of 5
Distribution of blood flow is mainly regulated by the:
Correct Answer: B
Rationale: Arterioles (B) regulate flow via resistance (smooth muscle). Arteries (A) conduct, capillaries (C) exchange, venules (D) collect.
Question 3 of 5
What type of tissue comprises the valves of the heart?
Correct Answer: A
Rationale: Heart valves are made of dense connective tissue (A), providing strength and flexibility. Areolar tissue (B) is loose, hyaline cartilage (C) is in joints, and cardiac muscle (D) forms the heart wall.
Question 4 of 5
Which of the following would lead to a decreased heart rate?
Correct Answer: C
Rationale: High plasma potassium (C) (hyperkalemia) slows heart rate by depolarizing cells, reducing excitability. Norepinephrine (A), thyroid hormone (B), and calcium (D) increase rate.
Question 5 of 5
Cardiac output can be computed by:
Correct Answer: D
Rationale: Cardiac output = stroke volume × heart rate (D), e.g., 70 ml × 75 bpm = 5.25 L/min.