Since viruses and bacteria attack the body from the outside, the body does not know in advance at which entry points its defense will tested. This means that the components of our immune system must be available everywhere in the body.
Immune System Defense at Entry Point
Our nose, mouth, and eyes are visible entry points for germs. Mucus and tears contain an enzyme that break down the cell walls of many types of bacteria. Saliva is also anti-bacterial. Our nasal-passages, lungs, throat and skin are lined with mast cells (resident cells of connective tissue) which play an important defensive role against bacteria and viruses. What’s more, our skin secretes anti-bacteria substances. Any germ that tries to reproduce in our body have to first go by these defenses.
Immune System Defense Inside The Body
Once the germ breaks past this first set of defense, it will be dealt with by the immune system at different level. The major components of this other set of defense mechanisms include our spleen, thymus (a ductless gland in our chest), lymph system, antibodies, bone marrow, white blood cells, complement system (a series of proteins) and hormones.Sponsored links: