What part of the immune system is a physical barrier quizlet?

The defense includes the skin and mucous membranes-the physical barriers along with antimicrobial substances that bathe them. Examples are: Skin and mucous membranes, tears, mucous, cilia in trachea, digestive (acid in stomach), urinary (flushing of urinary tract) and respiratory tract and reproductive systems.

What is the first physical barrier of the immune system?

The primary barrier to the entrance of microorganisms into the body is the skin. Not only is the skin covered with a layer of deceased, keratinized epithelium that is too dry for bacteria in which to grow, but as these cells are continuously sloughed off from the skin, they carry bacteria and other pathogens with them.