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

What are the kinds of plant geotropisms, What are the kinds of plant geotro...

What are the kinds of plant geotropisms? Why do the root and the stem present opposite geotropisms? The kinds of geotropisms are the positive geotropism, that in which the plan

Explain the objectives of history of mart disease, Explain the OBJECTIVES o...

Explain the OBJECTIVES of history of mart disease? After reading this unit, you should be able to: 1. Understand the importance of Cardio-vascular diseases as the leading cause

The km for an enzyme is equal to kcat, The Km for an enzyme A. is equal ...

The Km for an enzyme A. is equal to kcat, measured at low substrate concentration. B. is the substrate concentration that gives a velocity that is half the maximum velocity.

Gastrulation process - formation of primitive streak, Gastrulation Process ...

Gastrulation Process - Formation of Primitive Streak Gastrulation in all amniotes involving eutherian mammals is related to a characteristic structure termed as the primitive

Determine the stage 1 implant surgery, Determine the stage 1 implant surger...

Determine the stage 1 implant surgery Following stage 1 surgery, prior to commencing on the prosthetic procedures in the conventional loading protocol it is critical that the s

Explain dose-scaling, Dose-scaling Toxicological equivalent doses in a...

Dose-scaling Toxicological equivalent doses in animals and humans are a debatable issue. The Joint FAOIWHO Expert Committee on Food Additives (JECFA) and Joint FA01 WHO Meetin

Hematology case study , would i be able to get help on these case study que...

would i be able to get help on these case study questions

Intergenic interactions, what are intergenic interactions ? please explain ...

what are intergenic interactions ? please explain with example of cross breeding. and how we calculate the phenotype and genotype. explain epistasis, duplicate genes, supplementary

What is atrial switch operation and rastelli in heart diease, What is Atria...

What is Atrial Switch operation and Rastelli in Heart dieases? Atrial Switch Operation: (Senning or Mustard procedures) By means of a baffle the systemic venous blood could b

Why are glucorticoids used in transplant patients, Why are glucorticoids us...

Why are glucorticoids used in transplant patients? Patients with transplanted organs are prone to host versus graft rejection as their own immune system tends to attack the gr

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