Our body's first line of defense, the innate immune system, is a complex army of cells and processes working tirelessly. These unsung heroes include: - Physical Barriers: Skin and mucous membranes form a formidable frontline, like a castle wall, repelling invaders. - Phagocytes: These white blood cell warriors, like macrophages and neutrophils, engulf and destroy foreign microbes, acting as the system's janitors. - Chemical Warfare: Tears, saliva,...