Hair of the stinging nettle

Hair of the stinging nettle

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Caption: Stinging nettle hair. False-colour scanning electron micrograph (SEM) of the tip of a stinging hair of Urtica sp. , the stinging nettle plant. These leaf hairs are long and bear silicified tips which break off when the nettle is brushed or stroked. The sting penetrates the skin, injecting a mixture of acetylcholine and histamine. Acetylcholine is a neurotransmitter substance normally produced in nerves; histamine is a chemical mediator responsible for many unpleasant symptoms of allergic reactions. The result of the sting is a burning sensation of the skin, itching and a redness. Magnification: x1,000 at 6x4. 5cm size.

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Keywords: botany, hairs, leaf, leaf hair, leaves, nature, nettle, plant, plants, sem, stinging hair, stinging nettle, urtica sp.

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