Excretion

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  • The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical homeostasis and prevent damage to the body. The dual function of excretory systems is the elimination of the waste products of metabolism and to drain the body of used up and broken down components in a liquid and gaseous state. In humans and other amniotes mammals, birds and reptiles most of these substances leave the body as urine and to some degree exhalation, mammals also expel them through sweating. Only the organs specifically used for the excretion are considered a part of the excretory system. In the narrow sense, the term refer to the urinary system. However, as excretion involves several functions that are only superficially related, it is not usually used in more formal classifications of anatomy or function.
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Keywords for Facebook, Twitter and LinkedIn timeline photos

adrenal anatomy aorta artery biology bladder bones capsule cava cortex dorsal excretion gallbladder gland glomerulus heart human kidneys liver lungs mammals medulla nephrone organs pelvis science skin ureter urethar urinary vein 4k

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