Stinging hairs of nettle, Urtica dioica
Numéro d’image : 13416473
| Scanning electron micrograph of the leaf of a stinging nettle, Urtica dioica. The picture shows parts of three stinging hairs (yellow/brown). In contrast to normal leaf hairs ( background, green), the stinging hairs have an enlarged base (bottom, to left), and taper to a narrow end, which terminates in a small bulbous structure ( here red). The covering of the bulb is a glass-like wall containing silica. A defence mechanism, the bulb is easily broken open by a passing animal. The broken surface is sharp, and penetrates soft skin tissue, particularly the mouth parts of herbivores. The bulb injects a mixture of acetylcholine and histamine, chemicals that produce irritation and inflammation in mammals. The sting is effective at the slightest touch; grasping the nettle can sometimes evade the sting, because the hair breaks or bends without the tip piercing the skin. Mag x 190 at 10x8 | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 3468 px × 5212 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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