Which one of the following is related to the defense system of the human body?
Correct answer: B. White blood cells
- A. Red blood cells
- B. White blood cells
- C. Platelets
- D. Plasma
Explanation
"White blood cells" (also known as leukocytes) are a crucial component of the immune system and are responsible for defending the body against infectious diseases and foreign invaders."Red blood cells" and "platelets" are involved in the transportation of oxygen and clotting of blood, respectively, but do not play a direct role in the defense system. "Plasma" is the blood's liquid component containing various proteins, hormones, and nutrients. White blood cells conduct their defense activities by ingesting foreign materials and cellular debris, destroying infectious agents and cancer cells, or producing antibodies.
This question appeared on the NUMS 2019 (cancelled sitting) paper, which you can sit online with every answer explained.
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About Immunity
Specific defense mechanisms protect the body through antigen recognition by B and T lymphocytes. The topic covers clonal selection, antibody production, plasma and memory cells, cell-mediated responses, helper and cytotoxic T cells, and the difference between primary and secondary immune responses.
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