During healing, which cells are primarily involved in removing foreign objects?

• A. Red blood cells
• B. Platelets
• C. Fibroblasts
• D. White blood cells

Answer: (D)

White blood cells are the main players in cleaning up a wound. They perform phagocytosis, engulfing debris, bacteria, and any foreign material, then release enzymes to digest it. Neutrophils are among the first responders, with macrophages arriving soon after to continue the cleanup and to coordinate the signaling that recruits other repair cells. By removing debris and potential pathogens, they create a safer environment for tissue repair to proceed. Red blood cells simply carry oxygen; platelets focus on clotting to stop bleeding; fibroblasts are involved in rebuilding tissue by laying down collagen and matrix—tasks that come after the initial clean-up done by white blood cells.