Water and sodium ions are reabsorbed in:
Correct answer: D. Proximal Convoluted Tubule & Collecting Duct
- A. Urinary Bladder and Urethra
- B. Ureter
- C. Adrenal Cortex
- D. Proximal Convoluted Tubule & Collecting Duct
Explanation
The majority of water and sodium ion reabsorption occurs in the proximal convoluted tubule (PCT) of the nephron. Additional fine-tuning of water reabsorption (under ADH influence) happens in the collecting duct. The bladder and ureter are involved in urine storage and transport, not reabsorption. The adrenal cortex produces hormones like aldosterone (which affects sodium reabsorption) but is not a site of direct reabsorption.
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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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