21. The Immune System
First-Line Defenses: Chemical Barriers
Multiple Choice
Multiple ChoiceThe ____________ glands create sebum which makes the skin more __________ which decreases microbial growth.
A
Lacrimal glands; basic.
B
Salivary glands; hydrophobic.
C
Sweat glands; alkaline.
D
Sebaceous glands; acidic.
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