Nettle leaf stinging trichome, SEM

Nettle leaf stinging trichome, SEM

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Credit: THIERRY BERROD, MONA LISA PRODUCTION/ SCIENCE PHOTO LIBRARY

Caption: Nettle leaf stinging trichomes. Coloured scanning electron micrograph (SEM) of a stinging trichome (hair-like) on a leaf from of a stinging nettle (Urtica dioica). When brushed against, the stinging trichome breaks off and its tip penetrates the skin, injecting acetylcholine and histamine. These chemicals cause the painful and inflammatory response known as a nettle sting or rash.

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Keywords: acetylcholine, anatomical, anatomy, biological, biology, botanical, botany, close-up, colored, coloured, defence mechanism, defensive, detail, false-colored, false-coloured, flora, hair, hairs, histamine, inflammation, inflammatory response, leaf, nature, nettle, plant, scanning electron micrograph, scanning electron microscope, sem, sting, stinging nettle, surface, trichome, trichomes, urtica dioica

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