What is the primary role of the hypodermis in the human body?

The primary role of the hypodermis, also known as subcutaneous tissue, is insulation and energy storage. This layer, located beneath the dermis, contains a significant amount of adipose (fat) tissue, which serves multiple functions. The adipose tissue provides insulation by helping to retain body heat and preventing excessive heat loss, contributing to the regulation of body temperature. Additionally, it acts as an energy reserve, storing lipids that the body can utilize during periods of energy deficit or increased metabolic activity.

While other layers of the skin and systems in the body play roles in protecting against infection, regulating temperature, and nutrient absorption, the principal functions of the hypodermis are specifically related to its capacity for insulation and its role as an energy reservoir.