Question

Water is moved from the __________ into the capillaries of the vasa recta by way of the process of __________.

Multiple Choice

• descending loop; facilitated transport

• ascending loop; osmosis

• ascending loop; active transport

• descending loop; osmosis

Answer 1

A. Descending loop; Facilitated transport

• Descending loop receive filterate from PCT. It is permeable to water and impermeable to solute. Water moves out by Aquaporin (or water channel) which is facilitated transport (because it requires protein channel and water moves towards concentration gradient without the using ATP)
• Ascending loop is impermeable to water and permeable to solute. This concentrate the urine.

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