General Science • BiologyMedium
What is the primary role of red blood cells in the human circulatory system?
A. To produce antibodies and fight bacterial infections
B. To transport oxygen from the lungs to body tissues✓ Correct Answer
C. To facilitate blood clotting during vascular injury
D. To regulate plasma osmotic pressure and electrolyte balance
💡 Solution & Explanation
Red blood cells contain hemoglobin, an iron-rich metalloprotein that reversibly binds molecular oxygen in the pulmonary capillaries and releases it throughout systemic tissues. White blood cells defend against pathogens, platelets facilitate clotting, and plasma proteins regulate osmotic pressure. Mature mammalian erythrocytes lack nuclei and organelles to maximize hemoglobin capacity.
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