Oregon Esthetician State Board 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of the subcutaneous layer, also known as the hypodermis, is to give contour and smoothness to the body. This layer is composed mainly of fat cells and connective tissue, which act to insulate the body and store energy, as well as contribute to shaping the overall appearance of the body. By providing a cushion and a certain degree of elasticity, the subcutaneous layer plays a crucial role in the body's aesthetic quality, ensuring a smooth transition between the skin and underlying structures.

In contrast, the other functions mentioned in the options relate to different layers or functions of the body. For instance, while the subcutaneous layer can have some indirect effects on body temperature regulation, it is not its primary role; that function is largely managed by the skin and the body’s metabolic processes. Similarly, the protection of bones is mainly the job of the skin and muscle tissues, not the hypodermis. Finally, while the immune system is supported by various components within the skin, this is not a primary function of the subcutaneous layer itself.