Physiology 5 (easy) Flashcards Preview

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

Effect of atrial natriuretic hormone on Na+ reabsorption

A

Decreases Na+ reabsorption

2
Q

Effect of PTH on calcium and phosphate reabsorption

A

Increases calcium reabsorption

Decreases phosphate reabsorption

3
Q

NaCl reabsorption occurs in which part of the distal tubule?

A

Early (Na+K+2Cl- transport)

4
Q

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?

A

Late part

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

5
Q

What is the late collecting duct permeable to?

A
  • low ion permeability

- permeability to water (and urea) influenced by ADH

6
Q

Plasma half life of ADH

A

10-15 mins

7
Q

How does ADH work in the collecting duct?

A

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

8
Q

Effect of high ADH on permeability

A

=high water permeability

= hypertonic urine (up to 1400 mosmol/l)

9
Q

Effect of low ADH on permeability

A

= low water permeability

= hypotonic urine (

10
Q

Effect of low ADH on permeability

A

= low water permeability

= hypotonic urine (

11
Q

Na+ and water coupling

A

Proximal tubule and descending lop of henle

12
Q

Na + and Cl- coupling

A

Ascending loop of henle and distal tubule

13
Q

These produce net fluid reabsorption

A

Proximal tubule and descending loop of henle

14
Q

These produce dilution of urine

A

Ascending loop of Henle and distal tubule

15
Q

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

A

Distal tubule/collecting duct

16
Q

How much urine can the bladder hold?

A

250-400mls

17
Q

The 2 mechanisms that govern micturition/urination

A

1) the micturition reflex

2) voluntary control