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| Excretory Role Of Skin |
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| Skin plays an important role in excretion in the mammals. Skin of mammals is glandular and has 2 types of glands, e.g., sebaceous glands and sudoriferous or sweat glands. |
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| These are highly vascular, coiled, simple tubular glands. These separate the wastes from the blood and send it out in the form of sweat. Sweat is formed of water (99%), sodium chloride, lactic acid, some urea and carbon dioxide. |
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| Function of sweat |
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| (a) Excretion of excess of salts and water |
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| (b) Evaporation of sweat causing a cooling effect and helping to maintain body temperature. |
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| Sebaceous glands |
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| These are branched glands opening into the hair follicles. These secrete an oily secretion called as sebum formed of lipids like waxes. Sterols and some fatty acids. |
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Osmoregulation and Excretion Animals
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