OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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What is one of the primary functions of white blood cells?

  1. Transport oxygen to cells

  2. Protect the body from infection

  3. Form blood clots

  4. Maintain blood pressure

The correct answer is: Protect the body from infection

White blood cells play a crucial role in the immune system by protecting the body from infection. They are responsible for identifying and attacking pathogens such as bacteria, viruses, and fungi. White blood cells enhance the body's defense mechanisms through various actions, including producing antibodies that neutralize harmful invaders, engulfing pathogens through a process called phagocytosis, and coordinating the immune response to eliminate infections effectively. This protective function is vital for maintaining health and preventing diseases, making white blood cells essential components of the immune system.

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