The urinary system consists of the kidneys, ureters, urinary bladder, and urethra.The kidneys filter the blood to remove wastes and produce urine.The ureters, urinary bladder, and urethra together form the urinary tract, which acts as a plumbing system to drain urine from the kidneys, store it, and then release it during urination.t the same time that the sphincters relax, the smooth muscle in the walls of the urinary bladder contract to expel urine from the bladder. Production of Hormones. The kidneys produce and interact with several hormones that are involved in the control of systems outside of the urinary system. 1  Calcitriol.
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Pi (symbol Ï) is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space; this is the same value as the ratio of a circle's area to the square of its radius.(Area of a circle = Ïr2). This number is the same for every circle.i is the ratio of the circumference of a circle to its diameter. Ï is an irrational number, which means that its value cannot be expressed exactly as a fraction, Consequently, its decimal representation never ends or repeats.