ATI RN
Cardiovascular System Questions Questions
Question 1 of 5
The tough, loose-fitting outer layer of the sac covering the heart
Correct Answer: C
Rationale: The parietal pericardium (C) is the tough outer layer of the pericardial sac. Epicardium (A) and visceral pericardium (B) are on the heart, myocardium (D) is muscle.
Question 2 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 3 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 4 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.
Question 5 of 5
Which type of white blood cell plays a major role in immunity?
Correct Answer: C
Rationale: Lymphocytes (C) (T/B cells) are central to adaptive immunity.