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68D 101 Operating Room Specialist Practice Test

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Which skin layer has a protective function, shields the moist underlying tissues, and lacks blood vessels?
Correct Answer:
Epidermis
Explanation:
The outer protective barrier that lacks blood vessels is the epidermis. This layer is avascular, meaning it has no blood supply, which is a key feature of its role as a barrier. The epidermis is made of keratinized cells that form a waterproof shield, primarily in the stratum corneum, helping to prevent water loss and protect the moist tissues beneath from injury and infection. Deeper skin layers, like the dermis and subcutaneous (hypodermis), contain blood vessels and connective tissue, so they are vascular, unlike the epidermis.

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