CH 26- Collecting Duct System

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1

Collecting Ducts

receive fluid from multiple nephrons

2

Aldosterone `

what hormone controls the collecting ducts?

3

ADH (antidiuretic hormone)

this hormone controls the the permeability to water in the collecting ducts

4

Bicarbonate

what is reabsorbed in exchange for Cl

5

Urea

this substance is high in the collecting system fluid compared to the peritubular fluid

6

Papillary duct

the urea diffuses out of this portion and down its concentration gradient

7

pH of pertibular fluid

secretion of H is depended upon

8

Tubular fluid

In proximal through distal tubules (inside)

9

Peritubular fluid

interstitial fluid that surrounds the renal tubule (outside)

10

H

if pH falls in the peritubular fluid this ion is pumped into tubular fluid (inside)

11

Bicarb

if pH rises in peritubular fluid this is secreted into the tubular fluid (inside)

12

Acid-base

the pH level of the peritubluar fluid of the collecting duct system is determined by this balance