PSI Barbering Practice Exam

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Study for the PSI Barbering Exam. Prepare yourself with multiple choice questions and detailed explanations designed to help you succeed. Build your confidence and knowledge as you get ready for your licensing exam in the barbering profession!

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The epidermis contains no ________, but has many small nerve endings.

Blood vessels
Nerve fibers
Hair follicles
Sweat glands

The correct answer is: Blood vessels

The epidermis is the outermost layer of skin, and one of its defining characteristics is the absence of blood vessels. This layer primarily relies on diffusion from underlying tissues for nutrient exchange and waste removal. Because it does not contain blood vessels, it creates a protective barrier that limits direct blood supply, which is one of the reasons why wounds in the epidermis heal relatively quickly and are less prone to heavy bleeding compared to deeper layers of the skin. While the epidermis does contain many small nerve endings, which are responsible for sensations such as touch and temperature, it does not require blood vessels to fulfill its primary functions, as it is supported by the dermis beneath. The presence of sweat glands and hair follicles is found within the dermis and not specifically in the epidermis, reinforcing the idea that the epidermis itself is avascular (lacking blood vessels).