Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Question

Which of the following is NOT a surface barrier serving as the first line of defense? a. mucus b. antibody c. keratin d. oil

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