The Excretory System

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The excretory system is a passive biological system that removes excess, unnecessary materials from an organism, so as to help maintain homeostasis within the organism and prevent damage to the body. It is responsible for the elimination of the waste products of metabolism as well as other liquid and gaseous wastes, as urine and as a component of sweat and exhalation. As most healthy functioning organs produce metabolic and other wastes, the entire organism depends on the function of the system; however, only the organs specifically for the excretion process are considered a part of the excretory system. As it involves several functions that are only superficially related, it is not usually used in more formal classifications of anatomy or function. Excretory System Parts and their Functions The Liver-The liver detoxifies and breaks down chemicals, poisons and other toxins that enter the body. For example, the liver transforms ammonia (which is poisonous) into urea (which is then filtered by the kidney into urine). The liver also produces bile, and the body uses bile to breakdown fats into usable fats and unusable waste. Bile-After bile is produced in the liver, it is stored in the gall bladder. It is then secreted within the small intestine where it helps to break down ethanol, fats and other acidic wastes including ammonia, into harmless substances. Large Intestine-The large intestine collects waste from throughout the body. It extracts any remaining usable water and then removes solid waste. At about 5 feet long, it transports the wastes through the tubes to be excreted. Skin-Skin extracts sweat through sweat glands throughout the body. This helps to remove additional wastes. Furthermore, the sweat, helped by salt, evaporates and helps to keep the body cool when it is warm. Eccrine-Like sweat glands, eccrine glands allow excess water to leave the body.The
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