White Blood Cells

White blood cells (WBCs), also known as leukocytes, are essential components of the immune system. They help the body defend against infections by identifying, attacking, and destroying bacteria, viruses, and other harmful agents. WBCs are produced in the bone marrow and circulate through the bloodstream and tissues. There are several types, each with specific roles, such as neutrophils (first responders to infection), lymphocytes (attack specific pathogens and produce antibodies), and monocytes (phagocytes that engulf pathogens). A healthy level of WBCs indicates a strong immune response, while abnormal counts can signal infection, inflammation, or other medical conditions.