ATI RN
Cardiovascular System Quiz Questions Questions
Question 1 of 5
Blood pressure is higher in:
Correct Answer: D
Rationale: Blood pressure increases with age due to arterial stiffening, peaking in the elderly (D, ~130-140/80 mmHg). Infants (A, ~90/60), adolescents (B, ~110/70), and adults (C, ~120/80) have lower values.
Question 2 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 3 of 5
Which of the following terms identifies the anatomical region found between the lungs that extends from the sternum to the vertebral column and from the first rib to the diaphragm?
Correct Answer: D
Rationale: The mediastinum (D) is the central thoracic region between the lungs, from sternum to spine and first rib to diaphragm, housing the heart. Epicardium (A) is the heart’s outer layer, abdominal cavity (B) is below the diaphragm, and pericardium (C) is the heart’s sac.
Question 4 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 5 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.