Malpighian tubules, Biology

Assignment Help:

Malpighian Tubules

Other arthropods like insects and myriapods and arachnids have Malpighian tubules, the outgrowths of alimentary canal like excretory organs. Malpighian tubules are totally new structures, containing no resemblance either to nephridia or coelomoducts. Generally, the Malpighian tubules that are composed of single layered epithelium and are bathed in the blood of haemocoel. By the procedure of active secretion water passes into the lumen of Malpighian tubule together with nitrogenous wastes and dissolved salts. The secretion essentially takes place in the distal parts of the tubules. The proximal part of the tubule as well as the rectum is the sites of absorption. Most of the terrestrial arthropods excrete uric acid. The reabsorption of water results in the precipitation of urate crystals as nitrogenous waste, therefore the animals are termed as uricotelic. Peripatus which is also terrestrial lacks Malpighian tubules. Nevertheless it is uricotelic. The excretion of uric acid is acquired from the intestinal epithelium into the intestinal lumen. It is removed from the intestine within a peritrophic membrane which is sloughed off every 24 hours. There are also segmentally arranged coelomic excretory organs. The coelomoducts of Peripatus can be considered as vestigial organs of its aquatic ancestry, with a much reduced activity.


Related Discussions:- Malpighian tubules

Determine the types of cell, Determine the types of Cell Based OII the ...

Determine the types of Cell Based OII the degree of complexity of the cell organisation, two types of cells, namely, prokaryotes and eukaryotes, are recognised. The prokaryotic

Determine the term - neuropsychological approach, Determine the term - Neur...

Determine the term - Neuropsychological approach The neuropsychological approach relies on the use of tests in which poor performance may indicate either focal (localised) or d

How many progeny flies have vestigial wings, In the fruit fly Drosophila, a...

In the fruit fly Drosophila, a rudimentary wing called "vestigial" and dark body color called "ebony" are inherited at independent loci and are recessive to their dominant wild-typ

What is the significance of immunogenicity, Problem: Explain the proced...

Problem: Explain the procedure for import of cosmetics in US. - Briefly explain the procedure for import of cosmetics in US What are the major points to be considered whe

What is gene therapy, What is Gene therapy Gene therapy targets non ger...

What is Gene therapy Gene therapy targets non germ line cells, ie somatic cells, so will not directly affect gene pool. The frequency of the allele for the genetic disease w

How parasitic infections are found, How Parasitic infections are found? ...

How Parasitic infections are found? Parasitic infections are found throughout the world. With increasing travel, immigration, use of immunosuppressive drugs and the spread of A

Molluscan kidney, Normal 0 false false false EN-IN X-...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Name the methods for extracting phosphorous, Name the methods for extractin...

Name the methods for extracting phosphorous Phosphorus/phosphate - Phosphorous is estimated as phosphate. Some methods for extracting phosphorous are as follows:   Dyer met

What is fixism?, What is fixism? The Fixism is the theory about the div...

What is fixism? The Fixism is the theory about the diversity of life on earth that affirms that the current existent species were identical to species of the past and came out

Compare and contrast the effect of a deletion, Compare and contrast the eff...

Compare and contrast the effect of a deletion in the operator of the lactose operon with one in the operator of the histidine operon.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd