Renal Distal Tubule, Collecting Ducts And Urination Flashcards Preview

Physiology > Renal Distal Tubule, Collecting Ducts And Urination > Flashcards

Flashcards in Renal Distal Tubule, Collecting Ducts And Urination Deck (19):
1

What is the surrounding interstitial fluid of the renal cortex conc

300 mosmol/l

2

The distal tubule and the collecting duct are major sites for.....

Regulation of ion and water balance

3

What does ADH vasopressin do in the collecting duct

-increase water reabs
Reducing urinary output

4

What does aldosterone do to the collecting duct

Increases sodium reabs
Increases hydrogen ion and pottasium secretion
PRIMARY HORMONE FOR SALT BALANCE

5

What does atrial natriuretic hormone do in the collecting ducts

Decrease sodium reabs

6

What does parathyroid hormone do in the collecting duct

Increase calcium reabs
Decrease phosphate reabs

7

The distal tubule can be split into

An early and late section

8

What happens in the early state of the distal tubule

Sodium chloride reabs

9

What happens int he late distal tubule

Calcium reabs
Hydrogen ion sec
Sodium reabs
Pottasium reabs

10

What does the late collecting duct have

Low ion perm
Perm to water influenced by ADH

11

Where is ADH produced

Syn by neurones in supraoptic nucleus in the hypothalamus then from post pit

It is a neurohormone

12

He does ADH affect the collecting duct

Vasopressin --> type 2 vasopressin receptor --> conv atp to cAMP --> insert aquaporins --> increases water move into cell

13

What happens if there is is a high ADH comic in the plasma

High water perm
Hypertonic urine

14

What happens if there is slow ADH conc in the plasma

Low water permeability
Hypotonic urine

15

What happens to the urine osmolarity as the ADH conc in plasma increases

It increases

16

What sholens to the urine volume as the plasma conc of ADH increases

It decreases

17

What is the emptying process of the bladder known as

Micuration

18

What are the governing mechanisms of Micuration

The Micuration reflex (fill to max and invol passing of urine)
Vol control ( deliberate tightening of external sphincter to prevent urination )

19

What is the tubular fluid when leaving the loop of Henle to the distal tubule

Hypo-osmotic to plasma 100mosmol/l