Anatomy and Physiology II Practice Test

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What term describes the absence of urine?

Oliguria
Polyuria
Anuria
Pyuria

The correct answer is: Anuria

The term that describes the absence of urine is "anuria." Anuria refers to a medical condition characterized by the production of less than 100 milliliters of urine per day, which indicates severe impairment of kidney function. This situation may arise from various factors, including acute kidney injury, severe dehydration, or urinary tract obstruction, where the kidneys fail to filter waste effectively. In contrast, the other terms relate to different urinary conditions: oliguria refers to a reduced urine output, typically between 100 and 400 milliliters per day. Polyuria is the production of an unusually large volume of urine, while pyuria indicates the presence of pus in the urine, usually due to infection. Understanding these distinctions is crucial for diagnosing and treating various renal and urinary conditions.