Stinging nettle hairs, light micrograph

Stinging nettle hairs, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Stinging nettle hairs. Polarised light micrograph of three stinging hairs from a stinging nettle (Urtica dioica) leaf. When brushed against, the hairs break off and their tips penetrate the skin, injecting a mixture of acetylcholine and histamine. These cause the painful and inflammatory response, respectively. Magnification: x90 when printed at 10 centimetres wide.

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Keywords: biological, biology, botanical, botany, defence, defensive, flora, hair, hairs, hollow, inflammatory, leaf, leaves, light micrograph, light microscope, nature, needle, needles, painful, plant, plants, polarised light micrograph, polarised light microscope, polarized, protection, protective, stinger, stingers, stinging, stinging nettle, three, trichome, trichomes, trio, urtica dioica

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