Epithelial Surfaces Provide the First Line of Defense Against Infection

question 2

Multiple Choice

Epithelial surfaces provide the first line of defense against infection by the use of several types of mechanisms. One of the chemical mechanisms used by epithelia is:

• A) Joining of epithelial cells by tight junctions
• B) Secretion of antimicrobial peptides by epithelial cells
• C) Production of mucus, tears, or saliva in the nose, eyes, and oral cavity
• D) Movement of mucus by cilia
• E) Peristalsis in the gastrointestinal tract

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