ATI RN
Cardiovascular System Quiz Questions Questions
Question 1 of 5
First heart sound occurs during the period of:
Correct Answer: C
Rationale: S₁ occurs at isovolumetric contraction (C), when AV valves close and ventricles begin systole. Relaxation (A, B) is diastole, isotonic contraction (D) is ejection.
Question 2 of 5
Which of the following correctly lists the sequence of structures that a cardiac action potential follows in order to excite normal contraction of the heart?
Correct Answer: D
Rationale: The sequence is SA node (initiates), AV node (delays), Bundle of His, Purkinje fibers (D), ensuring atrial then ventricular contraction. Other options are out of order.
Question 3 of 5
If the AV node were forced to assume pacemaker activity, what would be the resulting pulse rate?
Correct Answer: D
Rationale: The AV node’s intrinsic rate is 40-60 bpm (D), slower than the SA node’s 60-100 bpm.
Question 4 of 5
Heart chamber that receives blood that has just passed through the right atrioventricular valve
Correct Answer: B
Rationale: The right ventricle (B) receives blood from the right atrium via the tricuspid valve (right AV). Atria (A, C) send blood, left ventricle (D) is systemic.
Question 5 of 5
The hormone produced in the heart that reduces the volume of blood
Correct Answer: C
Rationale: ANP (C), from the atria, reduces blood volume by promoting sodium and water excretion. ADH (A) and aldosterone (B) increase volume, renin (D) regulates pressure.