Lines of Defense
By: Averi and Madison
Your skin is the first line of defense. It provides a physical barrier to prevent bacteria, viruses, and parasites from entering your body.
Tears contain lysozyme which helps protect the eyes from bacterial invasion.
Similarly, saliva also contains lysozyme to protect the mouth from bacterial invasion.
The mucous membrane of the nose has mucous- coated hairs that trap and filter microorganisms, dust, and pollutants from inhaled air.
Earwax is produced naturally by glands in the skin of the ear canal. The wax is a defense mechanism meant to trap dust and dirt particles before they reach the eardrum.