The major function of red blood cells is

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A. nutrient transport B. cytokine stimulation C. blood cell proliferation D. gas transport

Correct Answer: D

Rationale: RBCs primarily transport oxygen and CO2 (D) via hemoglobin. Nutrients (A), cytokines (B), and proliferation (C) are not their roles.

Which of the following is/are involved in determining a person's total blood volume?

A. Age B. Body type C. Sex D. All of the above

Correct Answer: D

Rationale: Blood volume (~5L) varies with age, body size, and sex (D), averaging 70 ml/kg.

Which type of white blood cell plays a major role in immunity?

A. Monocytes B. Eosinophils C. Lymphocytes D. Basophils

Correct Answer: C

Rationale: Lymphocytes (C) (T/B cells) are central to adaptive immunity.

A hematocrit value of 42% would be:

A. the average for a man B. the average for a woman C. below average for a man D. below average for a woman

Correct Answer: B

Rationale: 42% (B) is average for women (~38-46%); men average ~45% (40-50%).

Granulocytes that protect against infections caused by parasitic worms

A. Neutrophils B. Eosinophils C. Basophils D. Lymphocytes

Correct Answer: B

Rationale: Eosinophils (B) target parasites with toxic granules.

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