Kidneys, Pair of purplish-brown organs that remove waste products and balance body's fluids., Nephrons, Tiny filtering units inside the kidneys where urea and water pass through., Glomerulus, A dense ball of small blood capillaries inside each nephron where blood enters., Ureters, Narrow tubes with muscular walls that continually tighten and relax to force urine downward., Bladder, A triangle-shaped, hollow organ in the lower abdomen whose walls expand to store urine., Sphincter muscles, Two circular muscles that close tightly like a rubber band to keep urine from leaking., Urethra, The final tube that allows urine to exit and pass outside the body., Urea, A liquid waste product carried in the bloodstream that is produced when protein foods are broken down.

The Urinary System

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