Which of the following features of human body prevent entry or growth of harmful microbes in the bod...........

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Which of the following features of human body prevent entry or growth of harmful microbes in the body ?

1.Skin

2.Acid in the stomach

3.Saliva

4.Eye tears

5.Mucus coating lining the respiratory tract

Select the correct answer using the codes below.

1, 2 and 5 only

4 and 5 only

1, 3 and 4 only

1, 2, 3, 4 and 5

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Explanation:

Innate immunity is non-specific type of defence, which is present at the time of birth. This is accomplished by providing different types of barriers to the entry of the foreign agents into our body.
Innate immunity consists of four types of barriers. These are
Physical barriers: Skin on our body is the main barrier which prevents entry of the micro- organisms.
Mucus coating of the epithelium lining the respiratory, gastrointestinal and urogenital tracts also help in trapping microbes entering our body

Physiological barriers: Acid in the stomach, saliva in the mouth, tears from eyes–all prevent microbial growth

Cellular barriers: Certain types of leukocytes (WBC) of our body prevent microbial growth