5.2.1 Loop of Henle

Question 1

What is the loop of Henle involved in?

Answer 1

• Reabsorbing more water from the glomerular filtrate.

Question 2

What process causes a lower water potential in the medulla?

Answer 2

• The movement of excess sodium ions being transported out of the ascending limb and the movement of less sodium ions being transported into the ascending limb.

Question 3

Is the ascending limb permeable or impermeable to water?

Answer 3

• Impermeable.

Question 4

Is the descending limb permeable or impermeable to water?

Answer 4

• Permeable.

Question 5

Why does the filtrate become more concentrated as it travels down the descending limb?

Answer 5

• Due to the loss of water and sodium ions moving in the descending limb.

Question 6

Why is the water potential always lower in the medulla than in the filtrate?

Answer 6

• So water will leave the collecting duct along its whole length.

Question 7

What would happen if the loop of Henle was longer?

Answer 7

• Greater sodium ion concentration can be produced deeper into the medulla, so more water can be absorbed along the length of the collecting duct.