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

What are the indications of implant removal, What are the indications of im...

What are the indications of implant removal? Failed implants need to be removed and the specific indications include: - Severe Perimplant bone loss (> 50 per cent implant le

Cyanotic congenital heart disease, Cyanotic Congenital Heart Disease   ...

Cyanotic Congenital Heart Disease   So far we have discussed the acyanotic congenital heart disease. Now we shall discuss some of  the main cyanotic congenital heart diseases.

Explain the spinal cord and its function, Spinal cord The elongated par...

Spinal cord The elongated part of CNS that runs downward in the spinal canal as continuationof medulla oblongata is called spinal cord. The functions of the Spinal Cord are

Neurons, hpw many neurons do we have?

hpw many neurons do we have?

Ornithophily - cross-pollination, Ornithophily - Cross-pollination In ...

Ornithophily - Cross-pollination In tropical areas, the birds dominate over insects as important pollinators. The most common among them are humming-birds, sun-birds and honey

Pressure and continuity, Pressure and Continuity Pressure Water...

Pressure and Continuity Pressure Water pressure increases with depth which varies in the ocean from 1 atmosphere where at the surface to 1000 atmosphere at the greatest

Point and non-point sources, Point and Non-Point Sources The discharg...

Point and Non-Point Sources The discharge of effluents in receiving water body at a specific site are referred to a point sources in contrast to the inflow of pollutants in a

Haemostatic mechanisms - circulation, Normal 0 false false ...

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

What is the kind of reproduction that occurs in roundworms, Q. What is the ...

Q. What is the kind of reproduction that occurs in roundworms? What usual feature do nematode sperm cells have? Nematodes reproduce sexually. The nematode sperm cell does not h

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