October 24, 2013

Excretion in Animals - General Knowledge

The process, by which waste product of metabolism from the system of an organism are eliminated from the body.
Organs of the Excretory System in Animals:
Lungs – removal of excess carbon dioxide
Liver – produces urea and uric acid as a by-product of the breakdown of proteins
Skin – removal of excess water, salt, urea and uric acid
Urinary System – kidneys filter the blood to form urine, which is excess water, salt, urea and uric acid.
Excretion in insects: Insects excrete carbon dioxide and uric acid crystals. Uric acid being a nitrogenous waste product is excreted by the malpighian tubules which are found between the junctions of the mid gut projecting into the blood filled cavity.
Excretion in annelids: Excretion in the annelids such as the earthworms is carried out by the niphridia which are found in each segment. They release the waste products through the opening s found on the body surface

Excretion in birds: Birds excrete carbon dioxide and uric acid. They use the lungs to excrete carbon dioxide and the kidney to excrete uric acid.


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