Multiple Choice
Which of the following is considered to be a barrier to entry of a pathogen?
21. The Immune System
Physical Barriers in First-Line Defenses: Skin
Multiple Choice
Why is keratin an important layer of defense against infection?
A
Keratin is hydrophobic which keeps the skin & hair dry which decreases microbial growth.
B
Keratin is the top layer of skin that regularly flakes off, removing microbes from the skin’s surface.
C
Keratin is the main component of the dermis making it hard to tear which decreases infections from wounds.
Verified step by step guidance1
Keratin is a fibrous protein found in the outer layer of the skin, known as the epidermis. It plays a crucial role in forming a protective barrier.
One of the key properties of keratin is its hydrophobic nature, meaning it repels water. This helps keep the skin and hair dry, creating an environment less conducive to microbial growth.
Keratinized cells in the epidermis are constantly being shed and replaced. This regular flaking off of the top layer of skin helps remove microbes from the skin's surface, reducing the risk of infection.
Keratin contributes to the toughness and resilience of the skin. It is a major component of the dermis, providing structural integrity and making the skin difficult to tear, which helps prevent infections from wounds.
Overall, keratin serves as a physical and chemical barrier, protecting the body from environmental threats and minimizing the risk of infections.
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