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Flashcards in Physiology 5 (easy) Deck (17)
1

Effect of atrial natriuretic hormone on Na+ reabsorption

Decreases Na+ reabsorption

2

Effect of PTH on calcium and phosphate reabsorption

Increases calcium reabsorption
Decreases phosphate reabsorption

3

NaCl reabsorption occurs in which part of the distal tubule?

Early (Na+K+2Cl- transport)

4

Ca2+ reabsorption
H+ secretion
Na+ reabsorption
K+ reabsorption
(+ aldosterone: K+ secretion when K+ secretory cells are activated)
occurs in which part of the distal tubule?

Late part

(early part of collecting duct also very similar to this)
(late part of collecting duct permeable to water)

5

What is the late collecting duct permeable to?

-low ion permeability
-permeability to water (and urea) influenced by ADH

6

Plasma half life of ADH

10-15 mins

7

How does ADH work in the collecting duct?

Increases permeability of luminal membrane by inserting new water channels (aquaporins)

8

Effect of high ADH on permeability

=high water permeability
= hypertonic urine (up to 1400 mosmol/l)

9

Effect of low ADH on permeability

= low water permeability
= hypotonic urine (

10

Effect of low ADH on permeability

= low water permeability
= hypotonic urine (

11

Na+ and water coupling

Proximal tubule and descending lop of henle

12

Na + and Cl- coupling

Ascending loop of henle and distal tubule

13

These produce net fluid reabsorption

Proximal tubule and descending loop of henle

14

These produce dilution of urine

Ascending loop of Henle and distal tubule

15

Site of hormone action (ADH, aldosterone, atrial natriuretic peptide)

Distal tubule/collecting duct

16

How much urine can the bladder hold?

250-400mls

17

The 2 mechanisms that govern micturition/urination

1) the micturition reflex
2) voluntary control