Which skin layer is responsible for thermal insulation and shock absorption?

• A. Dermis
• B. Subcutaneous layer
• C. Epidermis
• D. Stratum corneum

Answer: (B)

The subcutaneous layer, also known as the hypodermis, is primarily responsible for thermal insulation and shock absorption. This layer contains a significant amount of adipose tissue, which serves as an insulator against temperature changes and helps prevent the loss of body heat. The fat cells in this layer also act as a cushion, absorbing shock from external forces that could otherwise damage deeper structures, such as muscles and bones.

In contrast, the dermis contains connective tissue, blood vessels, and nerve endings but does not provide the same level of insulation or shock absorption. The epidermis is the outermost layer of skin, primarily serving as a barrier to protect against environmental factors but lacking significant insulation or cushioning properties. The stratum corneum is the outermost part of the epidermis and consists of dead skin cells, functioning mainly in protection and the prevention of water loss rather than in thermal regulation or shock absorption.