Which type of WBC is known for ingesting invading bacteria?

Neutrophils are a type of white blood cell (WBC) that play a crucial role in the body's immune defense system, particularly in fighting off bacterial infections. They are classified as granulocytes and are characterized by their multi-lobed nucleus and granular cytoplasm. Neutrophils are often the first responders to sites of infection or injury, quickly moving to areas where bacteria invade the body.

Once at the site of infection, neutrophils ingest invading bacteria through a process called phagocytosis. They engulf bacteria and other pathogens, effectively neutralizing them and helping to prevent the spread of infection. This action is critical for a swift immune response, as neutrophils can respond rapidly to signals indicating the presence of harmful microorganisms.

While lymphocytes are primarily involved in adaptive immunity and develop memory for pathogens, monocytes serve the role of differentiating into macrophages or dendritic cells to aid in the immune response but are not the first line of defense against acute infections. Basophils play a role in inflammatory reactions but do not have a direct role in ingesting bacteria like neutrophils do. Therefore, neutrophils are distinctly recognized for their ability to directly combat bacterial invasion through ingestion.