کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1972918 | 1060300 | 2009 | 7 صفحه PDF | دانلود رایگان |
The long legs of insects require adequate hemolymph flow for maintaining their metabolism and functions. The visualization of hemolymph flow in a pupal leg of the tenebrionid beetle Zophobas atratus revealed that, in addition to a general circuit across all segments (podomeres) of the leg, there were two shortcut channels running within the femur, which is the largest podomere. A unidirectional hemolymph flow was forced by periodic pumping movements of the abdomen and regulated by a valve that exhibited a metamorphic change from a tongue-shaped to a flap-shaped structure. The results suggest that insects with a simple (open) circulatory system have evolved a sophisticated circulatory mechanism that distribute hemolymph adequately to the individual podomeres, which have diverse morphologies and functions.
Journal: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology - Volume 153, Issue 2, June 2009, Pages 174–180