The disease in which patients passed urine that rapidly turned black on exposure to air is called:
Correct answer: B. Alkaptonuria
- A. Phenylketonuria
- B. Alkaptonuria
- C. Sickle cell anemia
- D. Hemophilia
- E. Anuria
Explanation
Alkaptonuria is an inherited condition that results in the buildup of homogentisic acid, causing urine to turn black upon exposure to air. This distinctive symptom differentiates it from other disorders. Phenylketonuria involves amino acid metabolism but does not affect urine color. Sickle cell anemia and hemophilia are blood disorders, not related to urine. Anuria is the absence of urine production, not a change in color.
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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