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Biology Medium FPSC Uploaded: 06 Aug 2026

What is the main function of red blood cells?

  • A Fighting infection
  • B Transporting oxygen
  • C Clotting blood
  • D Producing antibodies
Correct Answer: Option B — Transporting oxygen
Explanation:
Red blood cells contain hemoglobin, a protein that binds oxygen in the lungs and releases it to body tissues. They also help carry carbon dioxide back to the lungs for exhalation, sustaining cellular respiration.
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