Labels:daily OCR: SKIN OUR SKIN covers total area of approxim ately square metres (21 square feet). Skin varies in thickness from mm on the middle of your back to 0.5 mm on your eyelids. It made up two main parts, including an outer layer called the epidermis that forms the protective surface of the skin This surface IS consta ntly repla ced by new skin cells. The lower thic ker skin lay yer. called the dermis. contains hair roots. blood vessels glands that secrete oil and sweat and nerve endings It can detect pressure, pain, heat, or cold VOUR epide rmis thicke
