Question

white blood cells’ only purpose is ______.
to help the respiratory system
to make acid for the immune system
to work for the immune system
to help pathogens in the body

Explanation:

• Option 1: White blood cells are not primarily for the respiratory system (respiratory system involves organs like lungs, while WBCs fight infections).
• Option 2: White blood cells do not make acid for the immune system; their role is to defend against pathogens, not acid production.
• Option 3: White blood cells (leukocytes) are a key part of the immune system, working to identify and destroy pathogens, so this matches their purpose.
• Option 4: Pathogens are harmful, and white blood cells fight them, not help them.

Answer:

C. to work for the immune system