Question

Which of the following is a function of white blood cells (WBCs) in the human body?

• A. Transporting oxygen to tissues
• B. Fighting infections and diseases
• C. Producing insulin
• D. Clotting blood

Hint:

White blood cells are essential for immune defense, identifying and eliminating pathogens such as bacteria, viruses, and other harmful microorganisms.

Answer 1

The Correct Option is B

White blood cells (WBCs) are an important part of the immune system and play a key role in defending the body against infections.
- Option (1) is incorrect: Red blood cells (RBCs), not WBCs, are responsible for transporting oxygen to tissues using the hemoglobin protein.
- Option (2) is correct: White blood cells are involved in protecting the body from infections caused by bacteria, viruses, fungi, and other pathogens. They recognize and destroy foreign invaders through various mechanisms.
- Option (3) is incorrect: Insulin is produced by beta cells in the pancreas, not white blood cells.
- Option (4) is incorrect: Platelets are responsible for blood clotting, not white blood cells.
Thus, the main function of white blood cells is fighting infections and diseases.