Discussion
Which of the following does not act as a protecting barrier for the body surface?
Answer: D
Correct answer: Salivary amylase
Salivary amylase is a digestive enzyme: it breaks starch into sugars and has no defensive role. (Saliva does contain lysozyme, which does attack bacteria - but that is a different enzyme.) Skin is the physical barrier, mucus traps what lands on the linings, and gastric acid kills most of what is swallowed.
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