Question

1.) The skin acts as a physical barrier to infection, and is aided by the presence of:


a. Beneficial bacteria

b. Bacteriostatic enzymes

c. both a & b

d. None of above

Answer 1

The skin acts as a physical barrier in order to prevent the entry of harmful pathogenic microorganisms capable of causing infections. The skin is one of the most important barriers that form the innate immune system.

The barriers of the innate immune system include:

1. Physical Barriers (e.g., skin)
2. Defense Mechanisms (e.g., acid pH secretions)
3. General Immune Responses.

• The skin acts as a physical barrier to infection which is aided by the presence of BOTH beneficial microbes and bacteriostatic enzymes (Option C).

The innate barriers that protect skin from infection include:

• Acid secretions.
• Bacteriostatic enzymes (i.e., proteinases) that are secreted in the sweat.
• Commensal microorganisms (e.g., bacteria).

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