Answer :

When we eat food, some microbes also enter our gut along with the food and may cause several diseases. To prevent these microbial pathogens from entering the gut, our body has preventive barriers which are as follows:

1. Lysozome present in saliva

2. Mucous coating on the epithelium lining of the gut.

3. Hydrochloric acid secreted by the parietal cells in the stomach.

This type of immunity is known as Innate Immunity. This immunity provides the body with a defence mechanism in response to the antigens produced in the body when any pathogen enters the body. It includes physical barriers like skin, chemical barriers like HCl, lysozome and immunity cells like T & B lymphocytes. It is present in a person since birth.

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