ANATOMY

Detailed explanation-1: -Overview. Your body’s first line of defense includes the skin and other barriers that keep pathogens out of your body. The first line also includes tears, mucus, cilia, stomach acid, urine flow, and friendly bacteria.

Detailed explanation-2: -“White blood cells are among other places located in the oral mucosa, and they represent the body’s first line of defence against infectious agents. The mucus in the mouth causes the white blood cells to throw out a ‘net’ that traps bacteria”, explains Ole Sørensen from the Division of Infection Medicine.

Detailed explanation-3: -The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, ‘friendly’ bacteria and white blood cells called neutrophils.

Detailed explanation-4: -The mucus layer traps pathogens (potentially infectious microorganisms) and other particles, preventing them from reaching the lungs.