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Which structures are part of the body's first line of defense against pathogens? A. white blood cells B. red blood cells C. lymph nodes D. mucous membranes

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WindsorLynne
Choice A. White blood cells is the correct answer.


"The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils."

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luisvaschetto

The MUCOUS MEMBRANES are part of the body's first line of defense against pathogens (Option D).

  • The physical barriers such as the skin and mucous membranes represent the first line of defense against pathogenic harmful microorganisms (e.g. bacteria).

  • The first line of defense (surface defense barriers) of innate immunity helps to prevent the entry of pathogenic material into the body.

  • The mucous barrier consists of epithelial tissue that forms an internal barrier capable of preventing the entry of pathogens into the body.

  • The second line of defense consists of non-specific phagocytic cells, which also belong to innate immunity.

In conclusion, the MUCOUS MEMBRANES are part of the body's first line of defense against pathogens (Option D).

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https://brainly.com/question/1664744

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