General Science • BiologyMedium
What is the primary physiological function of human white blood cells in the circulatory system?
A. Transporting oxygen from lungs to systemic tissues
B. Defending the body against invading pathogens and foreign infectious agents✓ Correct Answer
C. Regulating blood clotting mechanisms during vascular injury
D. Maintaining plasma colloid osmotic pressure and fluid balance
💡 Solution & Explanation
White blood cells, or leukocytes, are essential cellular components of the immune system that protect the body against infectious diseases and foreign invaders through phagocytosis and antibody production. Red blood cells transport oxygen using hemoglobin, while blood platelets facilitate clotting. Plasma proteins maintain osmotic pressure. Leukocytes are classified into granulocytes and agranulocytes based on cytoplasmic staining characteristics.
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