Which kidney-related substance helps activate vitamin D and supports calcium absorption from the intestine?
Correct answer: B. Calcitriol
- A. Erythropoietin
- B. Calcitriol
- C. Renin
- D. Urokinase
Explanation
The kidneys convert vitamin D into calcitriol, the active form that promotes intestinal calcium absorption. Erythropoietin supports red blood cell production, while renin regulates blood pressure.
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About Urinary System
The urinary system includes the kidneys, ureters, urinary bladder and urethra, with emphasis on nephron structure and urine formation. It explains glomerular filtration, tubular reabsorption, tubular secretion, water and electrolyte regulation, acid base balance, and the roles of ADH and aldosterone in maintaining homeostasis.
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