Which of the following protects the body against infectious disease and foreign invaders?
Correct answer: D. Leukocytes
- A. Golgi apparatus
- B. Red blood cells
- C. Endoplasmic reticulum (ER)
- D. Leukocytes
Explanation
Leukocytes, or white blood cells, identify and attack pathogens and other foreign materials. Red blood cells mainly transport oxygen, while the endoplasmic reticulum and Golgi apparatus are cell structures rather than immune defenses.
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The human body is studied through its organ systems, including digestion, respiration, circulation, excretion, nervous coordination, reproduction and immunity. Coverage also includes nutrients and deficiency diseases, hormones, blood groups, common infections, vaccines, sanitation and basic first aid, while distinguishing communicable diseases from inherited and lifestyle disorders.
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