DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph of a sweat pore in human skin. The skin was obtained from a blister on the palm of a man's hand. The skin on human palms is arranged in ridges, with sweat pores appearing as miniature depressions tunnelling into the ridges. Sweat is a salty fluid containing small amounts of urea; it is secreted by sweat glands within the skin & emerges through the sweat pores. Excess body heat is used to evaporate sweat, resulting in the skin surface becoming cooler. Magnification: x130 at 35mm size, x205 at 6x4.5cm size.
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