| http://www.w3.org/ns/prov#value | - Their most important role is to filter blood and produce urine.Ultrasound: Abdomen Doctors order abdominal ultrasounds when they are concerned about symptoms such as abdominal pain, repeated vomiting, abnormal liver or kidney function tests, or a swollen belly.Kidney Diseases in Childhood The kidneys play a critical role in health.
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