Excretion in animal, Biology

Excretion In  Animal

To give out nitrogenous waste products after oxidation of food is excretion.

EXCRETORY MATERIALS -

1.      AMMONIA - Animals are amonotelic. It is aquatic adaptation. e.g. Protozoa, porifera, coelenterata, some polychaetes (Nereis), some crustacean (crab), some mollusca (Aplysia, sepia, octopus), fresh water teleost, tadpole larva of frog, aquatic tortoise.

2.      UREA - Ureotelic. Terestrial adaptation. Less poisonous than ammonia. e.g. some annelids (earthworm), some gastropods (Pila), elasmobranchi, adult amphibian, mammals.

3.      URIC ACID - Uricotelic. Its' chemical name is 2,6,8 trioxy purine. Last product of nucleic acid metabolism.

Xerophytic adaptation. Less poisonous, synthesized in liver. Eg. Insects, snails, reptiles, aves, desert mammals, camal.

4.      AMINO ACIDS - Aminotelic. In man 1.5 gms amino acids per day are excreted. e.g. unio, limnea, some echinoderms.

5.      CREATINE - Chemically it is methyl guanidoacetic acid. Stored in heart, testes, brain & uterus max. in striped muscles. More in urine of children & pragnent ladies. Arginine, glycine & methionine are essential for its synthesis. When creatin present in urine it is creatine urea. Anhydrous product of creatine is creatinine.

6.      AMINO ACIDS CONJUGATION - In mammals benzoic acid is fused with glycin amino acid to form hipparic acid. Also known as benzoglycine. In aves benzoic acid combines with ornithine to form ornithuric acid.

7.      TRIMETHYL AMINO OXIDE (TMO) - In some marine teleost.

8.      GUANINE - In spiders.

9.      HYPOXANTHINE & XANTHINE - In columba.

10.     MINERAL IONS - Na, K, Ca, Mg, Cl, are excreted. In sea birds and reptiles salt glands present to control mineral excretion. Marine fishes excrete minerals through gills. Marine fishes face great problem of water.

Posted Date: 10/2/2012 3:28:45 AM | Location : United States







Related Discussions:- Excretion in animal, Assignment Help, Ask Question on Excretion in animal, Get Answer, Expert's Help, Excretion in animal Discussions

Write discussion on Excretion in animal
Your posts are moderated
Related Questions
Cleft grafting  The stem of the stock is cut across. A 'V' shaped insertion is made at the end of the stock. The scion is cut in shape. The scion is inserted into the 'V'

MOUT H - It is as transverse slit. It is pseudo type i.e. not open directly into alimentary canal. Mouth is covered by upper & lower movable lips. Movement is due to arb


Specific Guidelines Physician's orders Each order should have the date and time it was written.  Some way of indicating which orders have been carried out is nece

Yeast is cultured in the presence of radioactive phosphate and the following biological molecules are purified. Which molecule should be most radioactive? A. An oligosaccharide B.

Disposal : Opaque bags are the recommended for disposing off carcasses. You should also put freshly dissected animals and tissues into opaque plastic bags, seal them and dispose t

Q. Do the membranes form only the outer wrapping of cells? Lipid membranes do not form only the outer cover of cells. Cell organelles, such as the Golgi complex, lysosomes, chl

Explain the Recommended Dietary Allowances - Nutrition? The recommended dietary allowances are defined as the 'daily dietary intake level that is sufficient to meet the nutrien

Social Status and Support Network Income and Social Status: Higher income and social status lead to better health.Employed persons, having more control over their workin

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