Urine formation in crustaceans, Biology

Assignment Help:

Urine Formation in Crustaceans

Urine formation in crustaceans involves filtration, re-absorption and secretion. In the end-sac of crayfish antennary gland chloride is reabsorbed from the isosmotic ultrafiltrate during its passage through the tubule so that the final urine excreted is hypoosmotic. Urine concentration is known to vary in crustaceans depending on whether they are freshwater or marine.

It is very dilute in the freshwater crustaceans, but it is close to the blood osmolarity in the crustaceans of brackish water. This may be due to the absence of salt-reabsorbing segment in the tubule of the marine forms. The hydrostatic pressure of the blood provides the driving force for filtration.


Related Discussions:- Urine formation in crustaceans

Congenital discrete subvalver stenosis, Congenital Discrete Subvalver Steno...

Congenital Discrete Subvalver Stenosis : The abstraction could be fibrous or fibro muscular. It could be anywhere from just below the aortic cusps upto the level of the free edge

Paper points & chemicals removal of gutta percha, Paper points & chemicals ...

Paper points & chemicals removal of gutta percha: -  Flushing action: residual of qutta- percha and sealers chemically solvent by floating pulp chamber with chloroform. -  Chem

Describe the various types of rna, Describe the various types of RNA? ...

Describe the various types of RNA? Types of RNA :  There are three different types of RNA, all formed by transcription from DNA: (1) Messenger RNA (mRNA) is a single unc

Determine how many family full-time family doctors, 1.  In the town of Jasp...

1.  In the town of Jasper, CA, there is currently one full-time family doctor. If the town's population grows at a steady rate of 14% per year, how many family full-time family doc

Name two foods which are a good source of this vitamin, a) Which vitamin he...

a) Which vitamin helps to maintain resistance to infectious diseases? b) Name two foods which are a good source of this vitamin.   a) Vitamin A (retinol) helps m

Define prevention of idd - communication campaign, Define prevention of IDD...

Define prevention of IDD - Communication Campaign? A mass communication campaign is needed to create awareness in the community about the consequences of IDD and the benefits o

Metabolism of lipids, The three main forms of fat found in food are glyceri...

The three main forms of fat found in food are glycerides (principally triacylglycerol [triglyceride], the form in which fat is stored for fuel), the phospholipids, and the sterols

Xerarch - ecology, Xerarch - Ecology Successions initiated on bare roc...

Xerarch - Ecology Successions initiated on bare rock, wind-blown sand, rocky talus slopes, or other situations where there is an extreme deficiency of water are termed xerarch

What are the role of mr, MR means medical representative. Medical rep has t...

MR means medical representative. Medical rep has to sell products of pharma companies or drug manufacturers. He has to go to doctors and medical shops to sell drugs and promote dru

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