DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Sweat pore. Scanning electron micrograph (SEM) of a sweat pore in the surface of human skin. The outer, superficial layers of cells of the epidermis are strengthened by the tough protein keratin, which serves as a waterproofing material and is impermeable to many disease organisms. A sweat pore is an opening to a gland located in the underlying dermis. Sweat is a salty fluid containing small amounts of urea. Through its secretion, the skin functions to control body temperature and maintain water balance. The evaporation of sweat results in a reduction in the skin surface temperature. Magnification: x130 at 35mm size.
Model release not required. Property release not required.