ATI RN
Cardiovascular System Practice Questions Questions
Question 1 of 5
Identify the valve that prevents blood from flowing back into the right ventricle.
Correct Answer: B
Rationale: The pulmonary semilunar valve (B) prevents backflow from the pulmonary artery into the right ventricle during diastole. The aortic valve (A) protects the left ventricle, tricuspid (C) the right atrium, and bicuspid (D) the left atrium.
Question 2 of 5
If you stand up too quickly and blood pressure drops, baroreceptors in the carotid arteries will signal the cardioregulatory center to send
Correct Answer: D
Rationale: Baroreceptors detect low BP and signal the medulla to send sympathetic signals (D) to increase heart rate and vasoconstriction, restoring BP. Parasympathetic (A, B) slows HR, C opposes the response.
Question 3 of 5
Compared to tissue fluid, the osmotic pressure of blood is typically ___; thus water moves into the ___
Correct Answer: A
Rationale: Blood’s osmotic pressure (oncotic, ~25 mmHg) is greater than tissue fluid’s due to plasma proteins (A), drawing water back into capillaries at the venous end. B, C, D mismatch osmosis direction.
Question 4 of 5
The vasomotor center that controls the diameter of blood vessels is located in the
Correct Answer: A
Rationale: The vasomotor center in the medulla oblongata (A) regulates vessel diameter via sympathetic signals. Pons (B), cerebrum (C), and cerebellum (D) have other roles.
Question 5 of 5
The end of the descending aorta branches into the:
Correct Answer: B
Rationale: The descending aorta (abdominal) ends by branching into the common iliac arteries (B) supplying the pelvis and legs. Celiac (A), renal (C), and mesenteric (D) branch earlier.