Give two examples of external innate immunity in humans.

Interpretation:
Provide two examples of external innate immunity in human beings.
Concept Introduction:
Immunity can be defined as a condition or state in which body is able to resist any particular infection or disease by counteracting the development of pathogens and preventing them from penetrating the body. Immunity has many weapons that fight against the pathogens such as antibodies and t cells.
Answer to Problem 1P
Actions performed by mucus and skin are two examples of external innate immunity in humans.
Explanation of Solution
The two examples of external innate immunity in humans are actions performed by physical barriers such as mucus and skin. All of these barriers act as a hindrance for the pathogens to penetrate and also, any specialized cell is not required to fight a pathogen. If this outer layer of defense is breached by a pathogen, then cellular warriors of the innate system come into action.
Therefore, the two examples of external innate immunity in human beings include physical barriers such as mucus and skin. They act as the first line of defense for the pathogens, thus any specialized cell is not required to fight against them.
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