What is the main function of the urinary system?, To digest food, To filter blood and produce urine, Which organ is NOT part of the urinary system?, Bladder, Stomach, What is urea?, A vitamin, A waste product from protein breakdown, Which hormone produced by the kidneys helps control red blood cell production?, Erythropoietin, Insulin, What are the tiny filtering units of the kidneys called?, Nephrons, Neurons, What is the function of the ureters?, To filter blood, To carry urine from the kidneys to the bladder, What is the main function of the bladder?, To store urine, To produce hormones, What do the sphincter muscles do?, Produce urine, Prevent urine from leaking, What is the function of the urethra?, To carry urine out of the body, To connect the kidneys, What color is normal healthy urine?, Dark brown, Pale straw or transparent yellow

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