ATI RN
Cardiovascular System Questions Questions
Question 1 of 5
All of the following will increase heart rate except:
Correct Answer: C
Rationale: Parasympathetic stimulation (C) (vagus nerve) slows heart rate; others increase it via sympathetic or reflex mechanisms.
Question 2 of 5
The amount of blood that flows out of a ventricle per unit of time
Correct Answer: B
Rationale: Cardiac output (B) is the total blood volume ejected from a ventricle per minute (stroke volume × heart rate). Stroke volume (A) is per beat, heart rate (C) is beats, afterload (D) is resistance.
Question 3 of 5
The major function of red blood cells is
Correct Answer: D
Rationale: RBCs primarily transport oxygen and CO2 (D) via hemoglobin. Nutrients (A), cytokines (B), and proliferation (C) are not their roles.
Question 4 of 5
Which of the following types of proteins is present at the highest percentage in the blood component labeled I in the figure?
Correct Answer: B
Rationale: Albumin (B) is ~55% of plasma proteins (assuming I is plasma). Globulins (A) ~35%, fibrinogen (C) ~7%, thrombin (D) is an enzyme.
Question 5 of 5
Which of the following is/are involved in determining a person's total blood volume?
Correct Answer: D
Rationale: Blood volume (~5L) varies with age, body size, and sex (D), averaging 70 ml/kg.