Sugar 101. Naturally occurring sugars and added sugars. There are two types of sugars in American diets: naturally occurring sugars and added sugars. Naturally occurring sugars are found naturally in foods such as fruit (fructose) and milk (lactose).
Epidermis, in zoology, protective outermost portion of the skin. There are two layers of epidermis, the living basal layer, which is next to the dermis, and the external stratum corneum, or horny layer, which is composed of dead, keratin-filled cells that have migrated outward from the basal layer. The melanocytes, responsible for skin colour, are found in the basal cells.
In general, the skin is made of epithelial cells, or cells that are tightly packed together in layers. Cells known as keratinocytes are the primary members of the epidermis. These are the cells that are made by the stratum basale and move outwards towards the stratum corneum.