"Excretory" Terms and Definitions
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| negative feedback | type of regulation that responds to a change in conditions by initiating responses that will counteract the change
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| urea | compound formed in the liver from ammonia and carbon dioxide and excreted primarily by the kidneys
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| excretion | removal of nitrogen-containing wastes from the body
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| hormone | signal molecule released into the bloodstream that triggers particular responses
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| endocrine gland | organ of the endocrine system that secretes hormones
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| target cell | cell with chemical receptors that cause it to respond to a particular hormone
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| kidney | main organ of the excretory system; excretes waste products and regulates water and salt balance
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| urine | liquid composed of water, urea, and other waste products; produced by the kidneys
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| ureter | tube extending from each kidney that carries urine to the urinary bladder
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| urinary bladder | sac that stores urine until it is eliminated from the body
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| urethra | tube leading from the urinary bladder through which urine exits the body
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| nephron | one of millions of tubes and its associated blood vessels in a kidney that extracts filtrate from the blood and refines it into urine
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| glomerulus | ball of capillaries in each nephron of a kidney that is the site of filtration
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| dialysis | treatment that processes blood outside the body
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