The Distal Tubule & The Collecting Duct

Question 1

what are the distal tubule and collecting duct major sites for

Answer 1

regulation of water and ion balance

Question 2

what are the water and ion balance in the distal tubule and collecting duct regulated by

Answer 2

hormones

Question 3

what hormone regulates water balance, and describe its effect

Answer 3

ADH, increases water reabsorption

Question 4

what hormones regulate ion balance

Answer 4

Aldosterone, Atrial natriuretic hormone and PTH

Question 5

describe the effect of PTH in regulation of ion balance

Answer 5

it decreases phosphate reabsorption and increases Ca2+ reabsorption

Question 6

describe the permeability of the distal tubule to water and urea

Answer 6

has LOW permeability to both, allows urea to be concentrated

Question 7

describe the permeability of the late collecting ducts to water and urea

Answer 7

has LOW permeability to both

Question 8

what can act to change the permeability of water and urea at the distal tubule/collecting duct

Answer 8

ADH