Chapter 44.4

Question 1

Proximal Tubule

Answer 1

responsible for reabsorption of ions, water, and nutrients

Question 2

Aquaporin

Answer 2

Also called water channels,
- mainly facilitating transport of water between cells.

Question 3

Descending Limb of the Loop of Henle

Answer 3

Reabsorption of water continues through channels formed by aquaporin proteins

• The filtrate becomes increasingly concentrated

Question 4

Ascending Limb of the Loop of Henle

Answer 4

• salt but not water is able to diffuse from the tubule into the interstitial fluid
• The filtrate becomes increasingly dilute

Question 5

Distal Tubule

Answer 5

• The distal tubule regulates the K+ and NaCl concentrations of body fluids
• Contributes to pH regulation

Question 6

Collecting Duct

Answer 6

• Carries filtrate through the medulla to the renal pelvis
• Reabsorption of solutes and water

Question 7

Countercurrent Multiplier System

Answer 7

The countercurrent multiplier system involving the loop of Henle maintains a high salt concentration in the kidney