Stinging hairs on stem of nettle
Numéro d’image : 11536266
| Macrophotograph of stinging hairs on the stem & leaves of a stinging nettle,Urtica dioica. The stings are long hairs with silicified tips which break off when the nettle is brushed against or stroked. The sting penetrates the skin,injecting a mixture of acetylcholine & histamine; the former is a neurotransmitter substance normally produced at nerve terminals,the latter a chemical mediator normally produced by mast cells & responsible for many of the unpleasant symptoms of allergic reactions. Only the long hairs on the leaf are stinging hairs; the short ones are harmless. Magnification: X 1 (35mm size) | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 2480 px × 3815 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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