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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A circle is a set of all points in a plane that are all an equal distance from a single point, the center. The distance from a circle's center to a point on the circle is called the radius of the circle. A radius is a line segment with one endpoint at the center of the circle and the other endpoint on the circle. For the circle below AD, DB, and DC are radii of a circle with center D. A line segment that crosses the circle by passing through the center of the circle is called the diameter. The diameter twice the length of the radius. In the circle above AC is the diameter of the circle. A chord is a segment that also has endpoints on the circle, but the line does not need to cross through the center. On the circle below BC and AC are chords. A diameter is a chord that passes through the center of the circle. A secant is a line that intersects with a circle at 2 different points.