Which of the following is an example of a phy | vedclass

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(A) The human body has various innate immunity barriers to prevent the entry of pathogens. $1$. Physical barriers: These include the skin and the mucu

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Saliva

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(A) The human body has various innate immunity barriers to prevent the entry of pathogens. $1$. Physical barriers: These include the skin and the mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts. $2$. Physiological barriers: These include acid in the stomach,saliva in the mouth,and tears from the eyes,which prevent microbial growth. $3$. Cellular barriers: These include leukocytes like $PMNL$-neutrophils,monocytes,and macrophages. Since saliva prevents microbial growth in the mouth,it is classified as a physiological barrier. Therefore,the correct option is $A$.

Which of the following is an example of a physiological barrier in the human body?

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