ATI RN
Cardiovascular System Questions and Answers Quizlet Questions
Question 1 of 5
Which statement about blood is not true?
Correct Answer: B
Rationale: RBCs are ~99% of formed elements, not 10% (B); other statements (A, C, D) are true.
Question 2 of 5
Slight vasodilation in an arteriole prompts a
Correct Answer: C
Rationale: Vasodilation widens the vessel, reducing resistance slightly (C) per Poiseuille’s law (resistance ∝ 1/radius⁴). Increase (A, B) occurs with constriction, huge decrease (D) overstates it.
Question 3 of 5
The ductus venosus is a shunt that allows
Correct Answer: C
Rationale: The ductus venosus (C) shunts oxygenated blood from the umbilical vein to the inferior vena cava, bypassing the liver, into the heart.
Question 4 of 5
The first heart sound represents which portion of the cardiac cycle?
Correct Answer: C
Rationale: The first heart sound (S1) is the closing of AV valves (C) at the start of ventricular systole.
Question 5 of 5
After medication teaching on atenolol (Tenormin), which of the following statements by a client with diabetes mellitus demonstrates an understanding of the atenolol?
Correct Answer: B
Rationale: Atenolol (B), a beta blocker, masks tachycardia, an early hypoglycemia sign in diabetics. It doesn’t cause hyperglycemia (A), or affect insulin action (C, D).