Excretion
is the elimination of wastes that are formed during the metabolism of various
substances in the body.
The
main substances excreted are nitrogenous substances like Ammonia, Urea and Uric
acid. Nitrogenous wastes are formed in the metabolism of amino acids and
nucleic acids.
Along
with these excess water, certain salts and organic substances are also excreted.
The main purpose of excretion is to maintain ionic balance in the body.
If
the metabolic wastes are not discharged from the body, they become toxic and
harm the body.
All the animals do not excrete the type of nitrogenous
wastes.
Some
animals, like crabs excrete ammonia, while frogs and man excrete urea, insects,
reptiles and birds excrete uric acid.
The
type of the product excreted may change during different stages of development
and availability of water.
Aquatic
animals prefer to excrete ammonia while animals like reptiles and birds, to
whom water is very scarce, excrete uric acid.
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