Regulation of body fluid compartments Flashcards
1
Q
What percentage of the body is water?
A
60%
2
Q
How is the water distributed?
A
40% body weight intracellular, 20% body weight extracellular. 60% of total bodyweight
3
Q
How is the 20% extracellular distributed?
A
80% interstitial fluid
20% Plasma
4
Q
What is the osmolality of ECF?
A
290m/osm
5
Q
What mechanisms regulate body fluid comparments?
Both up and down
A
- Osmolality HYPOTHALAMUS. If the osmolality is too high then ADH is released and vice versa
- Volume - Baroreceptors in the aortic arch and carotid sinus measure BP. If it is too low then the aldosterone pathway is initiated. If it is too high then ANP is released
6
Q
What does hypoosmotic contraction look like?
A
eg salt wasting
7
Q
what does hypoosmotic expansion look like?
A
Eg too much ADH - SIADH
8
Q
what does hyperosmotic expansion look like?
A
eg Increased Na
9
Q
what does hypersmotic contraction look like?
A
eg sweating
10
Q
what does isoosmotic expansion look like?
A
eg too much Hartmanns
11
Q
what does isoosmotic contraction look like?
A
eg cholera
