[Campbell Biology P.1037] Based on Figure 44.13 and the accompanying text, which of the follo... | Practice Question

Based on Figure 44.13 and the accompanying text, which of the following substances are actively reabsorbed from the filtrate into the interstitial fluid in the proximal tubule?

  • A: NaCl, Nutrients, H2O
  • B: NaCl, HCO3-, H+
  • C: NaCl, Nutrients, HCO3-, K+
  • D: H+, NH3, Urea

Explanation

The diagram indicates active transport red arrows for NaCl, Nutrients, HCO3-, and K+ out of the proximal tubule. The text further explains that Na+ is actively transported, driving Cl- passively, and that glucose, amino acids, K+, and other essential substances are actively or passively transported. HCO3- is also actively reabsorbed for pH balance.