Non-Specific Immune Response

1- Natural Barriers:
The skin is impermeable to microbes and protects the body against infections. The mucousa such as that of the respiratory, digestive and urogenital tracts, is protected by various means: for example , nasal secretions tarp dust, gastric juices  destroy most bacteria, the urinary stream washes the urinary tract. (John H. Humphrey, 2014).

2- Inflammatory Reaction:
A skin lesion, such as a wound, a prick or a burn, may cause an infection. this will lead to a local inflammation which is revealed by the following sign:

• Redness and heat, due to a dilation of the capillaries and an increased blood flow to the areas
•  Pain, due to the stimulation of the skin nerves.
• swelling under the skin, or edema, due to a massive plasma leak out of the capillaries.

Substances secreted by the microbes and by the body attract granulocytes and monocytes.

These migrates through the capillary walls into the surrounding inflamed tissue. The Monocyte become macrophage (Dakroub, 2011).

The Inflammatory Response, 

(The Inflammatory Response [HD Animation], 2014)

Why You Are Still Alive - The Immune System Explained,

 From (Kurzgesagt - In a Nutshell, 2014)

References

John H. Humphrey, M. (2014). Encyclopædia Britannica, Inc. Retrieved November 29, 2014, from http://www.britannica.com/EBchecked/topic/283636/immune-system.


Dakroub, R. N. (2011). Life and Earth Sciences (Basic Edition, Grade Eight ed.). Lebanon, Sin El Fil: Center for Educational Resarch and Development, Educational Company.

Kurzgesagt - In a Nutshell. (2014, July 1). Why You Are Still Alive - The Immune System Explained [Video file]. Retrieved from https://www.youtube.com/watch?v=zQGOcOUBi6s.

The Inflammatory Response [HD Animation] [Video file]. (2014, March 6). Retrieved from https://www.youtube.com/watch?v=426PDam1ey4