ATI RN
Cardiovascular System Quiz Questions Questions
Question 1 of 5
The two major opening of the left ventricle are:
Correct Answer: C
Rationale: The left ventricle has the bicuspid (mitral) valve (inflow from left atrium) and aortic valve (outflow to aorta, C). Pulmonary veins (A) enter the atrium, tricuspid (B) is right-sided, and inferior vena cava (D) enters the right atrium.
Question 2 of 5
Starling's law of the heart:
Correct Answer: C
Rationale: Starling’s law (C) states that increased venous return (preload) stretches the heart, increasing stroke volume and cardiac output. A is false (it operates but may fail), B is false (it applies), and D is sympathetic.
Question 3 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 4 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 5 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.