Single correct option
Which of the following blood cells mainly defends the body against infection?
- A. Red blood cells
- B. Platelets
- C. Plasma proteins only
- D. White blood cells
Show answer and solution
Answer: (D) White blood cells
White blood cells (leucocytes) engulf germs or make antibodies. Red blood cells carry oxygen with haemoglobin and platelets help clotting. A low white cell count weakens resistance to disease.
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