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.