Answer: Sodium ions.
- A Glucose only
- B Urea only
- C Water only
- D Sodium ions
Correct answer: D. Sodium ions
Explanation: Aldosterone promotes reabsorption of Na<sup>+</sup> (and water follows), raising blood volume and pressure.
Filtrate flows through four functionally distinct stages of the nephron: Bowman's capsule filters blood, the PCT reabsorbs most useful substances unconditionally, the Loop of Henle builds a concentration gradient via counter-current exchange, the DCT secretes selected substances, and the collecting duct performs the final ADH-controlled water reabsorption.
Concept context
Nitrogenous waste, kidney structure, urine formation in the nephron, and hormonal regulation of excretion.
Read the full Excretory Products and their Elimination notes →