Stinging nettle leaf, SEM

Stinging nettle leaf, SEM

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Caption: Stinging nettle leaf. Coloured scanning electron micrograph (SEM) of a stinging nettle leaf (Urtica dioica). Its long poisonous hairs protect the plant from herbivores. When touched, they cause pain and inflammation to the skin by inducing the release of a mixture of acetylcholine (a neurotransmitter that activates nerve cells) and histamine (a substance produced in allergic reactions). Magnification: x219 when printed 10 centimetres high.

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Keywords: biological, biology, botanical, botany, coloured, edible, false-colour, false-coloured, flora, hair, hairs, hairy, herb, herbal medicine, leaf, medical, medicinal, medicinal herb, nature, plant, plant anatomy, plants, poisonous, poisonous plant, scanning electron micrograph, scanning electron microscope, sem, sting, stinging nettle, trichome, trichomes, urtica dioica

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