Stinging nettle hairs SEM

Stinging nettle hairs SEM

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Caption: Nettle stinging hair. Coloured scanning electron micrograph (SEM) of a stinging hair (upper right) on the leaf of a stinging nettle (Urtica dioica). Stinging nettles are covered in long poisonous hairs which cause pain and inflammation when brushed against. They inject a mixture of acetylcholine, a neurotransmitter which activates nerves, and histamine, which is produced in allergic reactions. The shorter hairs are harmless. Nettles are a common plant of wasteland and grassland, and have these hairs as a protection against herbivores. Magnification: x135 at 6x7cm size. x210 at 4x5"

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Keywords: acetylcholine, botany, defence, defensive, histamine, inflammatory, leaf, leaves, nature, nettle, painful, plant, plants, protection, protective, scanning electron micrograph, sem, stinging hairs, urtica dioica

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