RayBerg
Forum Senior
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If 600 mL of water is ingested rapidly, plasma volume will increase by approximately how many mL?
A. 400 mL
B. 200 mL
C. 100 mL
D. 50 mL
E. 25 mL
Please show calculations.
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| RayBerg
Forum Senior
Topics: 32
Posts: 150
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This q is probably more tricky than you think. So give it a shot
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| Luckyall
Forum Guru
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Posts: 593
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rapid ingestion---> incr ECF, mainly ISF i d guess...hypoOsmol with movement of H2O across cell mb till trying to get a new Osmolar equil . , cells swell, but compensation never complete.
inside cell there is approx.143mOsm Na, so water flows in till an equil point reached btw this "inside cell" 300 mOsm and 600 ml ingested... however i came up with calculation of 100 mls going into VAS( vascular)
my answer is C
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| Luckyall
Forum Guru
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note... high high chances to be wrong 
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| doc179
Forum Guru
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I came up with 40, but since thats an option , I think would go for D. 50 ml
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| RayBerg
Forum Senior
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Doc, explain your ans pls. Technically, we should come up w/ the right answer!
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| drduck
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good Q.....i have to think....or read
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| RayBerg
Forum Senior
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ANYONE ...w/ the answer yet?
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| ssrpk
Forum Fanatic
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600 ml of free water would add up 600 ml to the pol of total body water, so all components should increase their water content equally based on their proportions...
now 2/3 of this 600ml will go ICF which equals 400ml
200 ml which remains in ECF, out of it roughly 3/4th will be retained in ISF, while 1/4th in the plamsa, so its probably about 50 ml
i will go with D
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| Ujk
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nice explanation ssrpk
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| drduck
Forum Guru
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good job.........SSRPK
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| RayBerg
Forum Senior
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D is the right answer!!! Good job everyone...
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| doc179
Forum Guru
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sorry, was not at home to check the threads. Thanx for the explanation ssrpk
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| GoodGirl
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I would not know it, thanks ssrpk for the explanation.
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Prioritize & simplify.
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| Ig F
Forum Elite
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yes....50 ml is the rigt answer........
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i m not perfect but i wanna get close to it......
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