1. Malpighian tubule
2. coxal gland
3. book lung
這三種東西是什麼?? 都找不到>..... 麻煩大家幫幫忙!!!
- jennyLv 71 decade agoFavorite Answer
Malpighian tubule The Malpighian tubules are the insects' main organ of excretion and osmoregulation, helping them to maintain water and electrolyte balance. They are named after their discoverer, Marcello Malpighi.The tubules are long thin outgrowths of the alimentary canal each consisting a single layer of cells and closed off at the end; they join the canal at the junction between the midgut and hindgut. Scale insects have just two, while large types of locusts may have up to 200; aphids are the only type of insect with no tubules.Pre-urine is formed in the tubules, when the nitrogenous waste and electrolytes (sodium, potassium and uric acid) are actively transported through the ends of the tubules. Water follows thereafter. The pre-urine, along with digested food, merge in the hindgut. At this time, uric acid precipitates out, and sodium and potassium are actively absorbed by the hindgut, along with water following through osmosis. Uric acid is left to mix with feces, where they are then ready for excretion.ReferencesP. J. Gullan and P. S. Cranston, The Insects: an Outline of Entomology, 2nd ed. (Blackwell Science, 2000) Scott Freeman, Biological Science (Upper Saddle River: Prentice Hall, 2002) book lung A book lung is a rudimentary type of lung found in arachnids, such as scorpions and spiders, and in horseshoe crabs. They are not evolutionarily related to mammalian lungs. Their name describes their structure, as they are "folded" like a book.The unfolded "pages" (plates) of the book lung are filled with hemolymph (the arthropod blood). The unfolding maximizes the surface exposed to air, and thereby the chances of gas exchange with the environment. In most species, no motion of the plates is required to facilitate this kind of respiration.External linkshttp://www.xs4all.nl/~ednieuw/Spiders/InfoNed/bloo...
2006-03-06 20:36:53 補充：
- 1 decade ago
1. Malpighian tubule---腎之馬比希氏管
2. coxal gland---基節腺.髖腺
3. book lung--書肺(蜘蛛類節之動物的囊狀呼吸器官)