Urine formation by excretory organs, Biology

Assignment Help:

Urine Formation by Excretory Organs

Urine formation by the excretory organs involves

  1. The movement of water (solvent)' and dissolved molecules of small size (solutes) from the  lumen of the excretory organ into the interstitial fluid and blood and
  2. Movement back across the plasma membranes of the intervening cells (cells of the renal organs and blood capillaries).

While a variety of renal organs are encountered in the animal kingdom, the principles of their function-are basically similar. In all cases, renal function involves the initial -appearance in the tubular lumen of a fluid called primary urine which is isosmotic to blood or body fluid from which it is derived. The composition and volume of the primary urine are later altered by the reabsorption of useful substances (e.g., glucose) into the blood and by the secretion of unwanted substances (e.g., urea) from the blood into the tubular fluid. Both reabsorption and secretion involve active transport. These modifications in the composition and volume of primary urine result in the formation of urine which is the fluid finally excreted from the body.


Related Discussions:- Urine formation by excretory organs

Work injuries based on type of accidents, Work Injuries Based On Type of Ac...

Work Injuries Based On Type of Accidents Earlier we identified four kinds of injuries mainly based upon type of disability. This classification is needed for the purposes of c

Explain about the parkinson''s disease, Explain about the Parkinson's disea...

Explain about the Parkinson's disease? Parkinson's disease is a degenerative central nervous system (CNS) condition characterized by progressive loss of cells within substantia

What volume of 4x protein sample buffer, What volume of 4x protein sample b...

What volume of 4x protein sample buffer do you need to add to 15 ml of a cell extract in order to load it on a gel?

Explain the clinical features of ps and vsd, Explain the Clinical Features ...

Explain the Clinical Features of PS and VSD ? Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

How do sponges try to protect themselves, Q. How do sponges try to protect ...

Q. How do sponges try to protect themselves against harm from the environment? Is that method rudimentary or efficient? Sponges can close their pores to avoid the entrance of w

Consciousness as inner state, Q. Explain Consciousness as inner state? ...

Q. Explain Consciousness as inner state? Consciousness as inner state: We are conscious of thoughts, images, emotions and memories within ourselves though they may not have phy

Parasitic diseases - fascioliasis, P a r a s i t i c Diseases ...

P a r a s i t i c Diseases F a s cioliasis It is a liverfluke infestation characterized by hepatic insufficiency, bile duct obstruction, and poor production per

Producers-biotic components, Producers Autotrophs (self-nourishing) are...

Producers Autotrophs (self-nourishing) are green plants as they synthesise carbohydrates from simple inorganic raw materials like carbon dioxide and water in the presence of su

What is the physiological cause of the syndrome, What is the physiological ...

What is the physiological cause of the syndrome known as cretinism? Cretinism is caused by chronic deficiency of the thyroid hormones (T3 and T4) during childhood. The chronic

What is phenotypic ratio, The F2 phenotypic ratio from a dihybrid cross wit...

The F2 phenotypic ratio from a dihybrid cross with epistasis was 9:3:4. If instead of a dihybrid cross, a double heterozygote was test crossed (crossed to a homozygous recessive in

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