Arkansas Esthetician Practice Exam

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What is the toughest layer of the epidermis called?

Stratum basale
Stratum corneum
Stratum granulosum
Stratum spinosum

The correct answer is: Stratum corneum

The stratum corneum is the outermost layer of the epidermis and is responsible for providing protection against external factors such as bacteria, viruses, and physical damage. It also helps to retain moisture in the skin. The other options listed are all layers found in the epidermis, but they are not the toughest layer. The stratum basale (option A) is the deepest layer of the epidermis while the stratum granulosum (option C) and stratum spinosum (option D) are middle layers. These layers are important for cell growth and production of keratin, a protein that helps to strengthen and waterproof the skin. All of these layers work together to maintain the overall health and function of the skin, but the stratum corneum is the toughest and most visible layer.