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Flashcards in control of water and electrolytes Deck (14)
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1

water is gained by which 2 methods?

- ingestion
- formed in metabolism

2

water is lost by which 2 methods?

- excretion
- evaporation

3

how much water does the average person gain and lose per day?

2400ml

4

which hormone is the main control for water?

ADH

5

how are sodium levels controlled?

- renin-angiotensin-aldosterone system
- atrial natriuretic hormone

6

what does the renin-angiotensin-aldosterone system do?

- promote reabsorption of sodium and water in distal convoluted tubule

7

what is angiotensin?

potent vasoconstrictor

8

what does atrial natriuretic hormone do?

increase excretion of sodium and water

9

which hormone has the opposite effect of atrial natriuretic hormone?

aldosterone

10

which hormone regulates potassium levels?

aldosterone

11

hypo secretion of ADH causes what condition?

diabetes insipidus

12

hyper secretion of ADH results in what?

water retention

13

what effect does increased ECF potassium have on nerve function?

depolarisation causing APs and prolonged refractory period

14

how do potassium salts in toothpastes work to desensitises teeth?

- potassium ions diffuse along dentinal tubules raising potassium concentration at the inner end of the tubule
- this depolarises the nerve, sodium channels are inactivated, and prolonged refractory period is sustained