ATI RN
Cardiovascular System Test Questions Questions
Question 1 of 5
Which of the following events is the first to take place in a cardiac cycle?
Correct Answer: A
Rationale: The cardiac cycle begins with SA node depolarization (A), initiating the impulse that spreads across the atria (P wave, C), reaches the AV node (B), and then ventricles (QRS, D). SA node firing is the first event.
Question 2 of 5
A heart rate of less than 60 beats per minute is called
Correct Answer: D
Rationale: Bradycardia (D) is a heart rate <60 bpm. Heart block (A) is a conduction issue, tachycardia (B) is >100 bpm, and fibrillation (C) is uncoordinated beating.
Question 3 of 5
Contraction of skeletal muscles will ___ venous return, thus ___ stroke volume.
Correct Answer: C
Rationale: Skeletal muscle contraction (muscle pump) compresses veins, increasing venous return (C), which increases preload and stroke volume per Frank-Starling’s law. A, B, D mismatch effects.
Question 4 of 5
Inflammation of veins, called ___ is a serious condition because a thromboembolism may occur.
Correct Answer: A
Rationale: Phlebitis (A) is vein inflammation, risking thromboembolism (clot dislodgement). Varicose veins (B) and hemorrhoids (C) are vein conditions, pulmonary embolism (D) is a result, not the condition.
Question 5 of 5
Identify the hormone(s) that will decrease blood volume and thus blood pressure.
Correct Answer: C
Rationale: ANH (C) decreases blood volume and BP by promoting sodium/water loss and vasodilation. ADH and aldosterone (A, B, D) increase volume.