describe various mode of excretion in animals
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Explanation:
Chemical reactions occur in the cells of living organisms all the time to carry out the life processes.
The sum of these reactions is called metabolism. Metabolism produces useful products as well as toxic (poisonous) by-products.Although the kidneys are the main organs of excretion, the skin, lungs and liver also help in excretion.
Skin:
Our skin has sweat glands, through which we excrete small amounts of water, urea and salts.
Liver:
The liver excretes bile, which contains bile pigments. These are produced by the breakdown of old RBCs in the liver. As hemoglobin breaks down, its iron is retained, while the pigment (haem) is excreted with the bile. The liver also excretes cholesterol.
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