Shaurya Kapoor 23rd Mar, 2020

Physical defenses provide the body's most basic form of nonspecific defense. They include physical barriers to microbes, such as the skin and mucous membranes, as well as mechanical defenses that physically remove microbes and debris from areas of the body where they might cause harm or infection.

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https://bio.libretexts.org/Bookshelves/Microbiology/Book%3A_Microbiology_(OpenStax)/17%3A_Innate_Nonspecific_Host_Defenses/17.1%3A_Physical_Defenses