excretion is the outward expulsion of waste products, which are CO 2 the H 2 O and NH 3 , ammonia, or any its derivatives, such as urea and uric acid.
these byproducts of cellular respiration. CO 2 and H 2 Or will the circulatory, respiratory, and then finally to the outside. Nitrogen compounds, however, are toxic and are therefore eliminated from the circulatory system by filtering the blood and are expelled to the outside. This is done by the excretory apparatus. Aquatic animals excrete in the form of NH nitrógano 3 through the gills, but the land animals, not predetermined fluid, excreted in a highly concentrated solution, urine, and in the form of urea or uric acid, which are not as poisonous.
The excretory apparatus always consist of an area where products are filtered excretion and a long tube where these products are concentrated, due to the readsorption of water they are dissolved. The nephridia of annelids, the glands in the antennae of crustaceans, myriapods coxal glands, Malpighian tubes of insects and vertebrates the kidneys are some of the various types of excretory apparatus with the various types of metazoans.
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