Excess upper abdominal fat may occur from years of poor diet, lack of exercise and stress. Age and genetic factors also play a role in where your body accumulates belly fat. Upper abdominal fat tends to be visceral fat -- the kind of fat that lies between your abdominal wall and your organs.
Skin (percutaneous, dermal) absorption is a term that describes the transport of chemicals from the outer surface of the skin both into the skin and into the systemic circulation. The surface area of an adult is about 20,900 cm3 and the surface area of a child of 6 years is about 9,000 cm3. 2  These figures and figures for other body parts or portions can be found in the EPA Exposures Handbook 1996 or estimated using other databases.
Skin Function: Sensing. Protective Barrier. The dermis does more than just regulate your body temperature. Because the dermis contains oil glands, it also controls the secretion of oils on your hair and skin that serve as a protective barrier against foreign substances.hen the body is hot, the red blood cells expand, allowing heat to be released through the surface of the skin [source: The Merck Manuals ]. The subcutaneous layer is made up of fat cells and fibrous tissue [source: The Merck Manuals ]. Like the dermis, the subcutaneous layer helps to regulate body temperature.