Pennsylvania Esthetician State Board Practice Exam

Which of the following is NOT a function of the subcutaneous layer?

1. Insulation

2. Shock absorption

3. Housing blood vessels

4. Production of sebum

The correct answer is: Production of sebum

The subcutaneous layer, also known as the hypodermis, plays several critical roles in the overall functioning of the skin. Among its primary functions are insulation, shock absorption, and housing blood vessels. Insulation is provided by the fat cells in the subcutaneous layer, helping to regulate body temperature by maintaining heat. Shock absorption is another key function, as the fatty tissue cushions underlying structures such as muscles and organs, protecting them from external impacts. Additionally, the subcutaneous layer contains larger blood vessels, connecting them to other structures in the skin and providing the necessary nutrients and oxygen. Production of sebum, however, is not a function of the subcutaneous layer. Sebum is an oily substance secreted by sebaceous glands, which are primarily located in the dermis, the layer of skin just above the subcutaneous layer. Therefore, identifying this function as separate from the responsibilities of the subcutaneous layer underscores its distinct biological role in skin health and structure.