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The skin is often called “the body’s first line of defence.” It acts as armour, resisting many germs that might harm the more delicate parts of the body. Any brain in the skin, even a pin prick, provides an opening for dangerous germs. Some germs enter the body through the nose and mouth and other natural openings. These areas provide warmth and moisture, in which germs thrive. When the membrane of the nose and throat becomes irritated, we cough or sneeze, blowing out the unwanted substances.
Other body liquids also provide a defence against disease. Tears, for example, wash bacteria from the eyes. Tears also contain substances that fight bacteria. Acid in the stomach kills many germs before they can reach other parts of the body.