[Campbell Biology P.1037] Based on Figure 44.13, which of the following statements accurately... | Practice Question

Based on Figure 44.13, which of the following statements accurately describes the transport characteristics of the loop of Henle?

  • A: The descending limb is permeable to NaCl but impermeable to water.
  • B: The ascending limb is permeable to water but impermeable to NaCl.
  • C: The thick segment of the ascending limb actively transports NaCl out of the filtrate.
  • D: Both the descending and ascending limbs are freely permeable to water.

Explanation

Figure 44.13 clearly shows a red arrow indicating active transport of NaCl out of the thick segment of the ascending limb of the loop of Henle. The accompanying text also confirms that the thick segment of the ascending limb actively pumps out NaCl.