ATI RN
Cardiovascular System Practice Questions Questions
Question 1 of 5
What is common between systemic and pulmonary circulation?
Correct Answer: A
Rationale: Both circulations handle the full cardiac output (~5 L/min, A). Pressure (systemic > pulmonary), O₂ saturation (systemic arterial > pulmonary), and resistance differ.
Question 2 of 5
The difference between a person's maximum cardiac output and resting cardiac output is called the
Correct Answer: D
Rationale: Cardiac reserve (D) is the difference between maximum and resting cardiac output, reflecting heart capacity.
Question 3 of 5
Valve that opens into the left ventricle
Correct Answer: B
Rationale: The mitral valve (B) opens into the left ventricle from the left atrium during diastole. Aortic (A) is outflow, tricuspid (C) and pulmonary (D) are right-sided.
Question 4 of 5
The relaxation of vascular muscles that decreases resistance to blood flow
Correct Answer: B
Rationale: Vasodilation (B) relaxes vascular smooth muscle, reducing resistance and increasing flow. Vasoconstriction (A) increases resistance, others (C, D) are unrelated.
Question 5 of 5
Which of the following plasma proteins plays a role in disease resistance?
Correct Answer: B
Rationale: Globulins (B), including antibodies, aid in disease resistance. Albumin (A) maintains osmotic pressure, fibrinogen (C) aids clotting, myoglobin (D) is in muscle.