ATI RN
Cardiovascular System Assessment Questions Questions
Question 1 of 5
Parasympathetic stimulation of heart causes:
Correct Answer: A
Rationale: Parasympathetic (vagal) stimulation slows the SA node (A), reducing heart rate (bradycardia). B, C, and D are sympathetic effects.
Question 2 of 5
The hemoglobin oxygen saturation of blood entering the right atrium is about:
Correct Answer: C
Rationale: Venous blood in the right atrium has ~75% O₂ saturation (C, SvO₂) after systemic use (~25% extracted). A, B, and D underestimate normal values.
Question 3 of 5
Which valve below prevents blood from flowing back into the right ventricle?
Correct Answer: C
Rationale: The pulmonary semilunar valve (C) prevents backflow from the pulmonary artery into the right ventricle. Tricuspid (A) guards atrium-to-ventricle, bicuspid (B) is left-sided, and aortic (D) is systemic.
Question 4 of 5
Which of the following selections lists conditions that would lead to increased stroke volume?
Correct Answer: C
Rationale: Increased stroke volume occurs with increased preload (more filling), decreased afterload (less resistance), and increased contractility (stronger contraction, C). Other combinations counteract.
Question 5 of 5
Valve through which the left ventricle pumps blood
Correct Answer: B
Rationale: The left ventricle pumps blood through the aortic semilunar valve (B) into the aorta during systole. Mitral (A) is inflow, pulmonary (C) is right-sided, tricuspid (D) is right AV.