Macrophotograph of an inflorescenece (flowering shoot) of the cocksfoot grass Dactylis glomerata,showing pollen-bearing anthers (tiny boat-shaped structures) dangling from individual flowers. Cocksfoot pollen,a summer grass pollen abundant in June,is a cause of hay fever. Sufferers produce a sensitising antibody,immunoglobin E (IgE),which attaches to cells in the nose & eyes. It reacts with inhaled pollen (allergen) causing the release of various chemicals,including histamine. Histamine causes the mucous membranes of the nose,eyes & throat to swell & become inflamed,bringing on the familiar hay fever symptoms. Mag: X2 at 35mm size | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Burgess, Dr. Jeremy |
Bildgröße: | 2576 px × 3892 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |