White blood cells (WBCs) are vital for immune defense, protecting the body from infections and foreign invaders. To understand their functions effectively, focus on their types: neutrophils (fight bacteria), lymphocytes (produce antibodies), monocytes (clean up debris), eosinophils (combat parasites), and basophils (trigger allergic responses). Observing lab results, symptoms, and medical history helps interpret their role in health. For example, a high WBC count often signals infection, sometimes treated with antibiotics from a ceftriaxone injection supplier. Combining textbook study, clinical examples, and case analysis can deepen understanding, making WBC function interpretation more practical in real-world medical settings.