Answer :
Final answer:
The skin protects the body from pathogens primarily by trapping them in oil and sweat. This creates a physical barrier against harmful microorganisms, as well as produces substances that can neutralize these threats. Therefore, skin is an essential part of the immune defense system.
Explanation:
How Skin Protects the Body from Pathogens
The skin is the body's first line of defense against pathogens, which are harmful microorganisms like bacteria and viruses. Among the provided options, the correct answer is A: It traps pathogens in oil and sweat produced by glands. The skin contains sebaceous glands that produce oil, and sweat glands that help to flush out potential pathogens, thereby providing a barrier to infection.
When skin is intact, it serves as a physical barrier preventing pathogens from entering the body while also having acidity and moisture that can hinder microbial growth. Additionally, skin secretes antimicrobial peptides that provide further defense against invading pathogens. Thus, these mechanisms ensure that the skin not only traps potential threats but also neutralizes them.
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