The four structures listed are part of the human excretory system. Bladder, Kidney, ureter, urethra in which order does a molecule of urea pass through these structures?
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Filtration, Reabsorption, Secretion: The Three Steps of Urine Formation. The kidneys filter unwanted substances from the blood and produce urine to excrete them. There are three main steps of urine formation: glomerular filtration, reabsorption, and secretion.
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