Fat present below the skin surface in our body, acts as a barrier against

1. The question asks about the function of subcutaneous fat (fat present below the skin surface) as a barrier. 2. Subcutaneous fat acts as an insulator, reducing the rate of heat loss from the body to the environment. This helps in maintaining body temperature, especially in cold conditions. 3. While skin itself acts as a barrier against fluid loss and microbial entry, the primary barrier function specifically attributed to the subcutaneous fat layer is thermal insulation. 4. Fat is not primarily a barrier against the loss of essential body fluids or salts; the skin (epidermis and dermis) plays a more direct role here. 5. The skin surface and immune cells within the skin are the main barriers against harmful micro-organisms.