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Drowning and Osmosis...

Human Anatomy, Physiology, and Medicine. Anything human!

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Drowning and Osmosis...

Postby Aerlinn » Wed Feb 01, 2006 10:42 am

If a drowining person inhales fresh water into their lungs, death occurs rapidly in about three minutes. If a drowning person inhales sea water instead of fresh water, death occurs more slowly taking about six to eight minutes. Use your understanding of osmiosis to explain the differnce between inhaling fresh water and sea water. You will need to consider the relative salt concentrations of sea water (1100 mOsm), blood (300 mOsm) and fresh water (0 mOsm)
I would like some help with this :)
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Postby Aerlinn » Tue Feb 07, 2006 10:03 am

Does anyone know? =(
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Postby MrMistery » Tue Feb 07, 2006 7:42 pm

Yes... Do you understand how osmosis works?
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Postby Aerlinn » Wed Feb 08, 2006 9:58 am

Yes, but not in this question :cry: ... otherwise I wouldnt have asked ^^
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Postby Dr.Stein » Thu Feb 09, 2006 4:44 am

Hey, Andrew (a.k.a. MrMystery) is correct, he directs you to explain it by yourself. If you understand the concept of osmosis, you will be able to answer the question.

Ok, I give you more clue:
Compare the concentration between saline:blood and freshwater:blood. This is an idea to answer why the drowning is slowly in saline rather than in freshwater.

Try to write your answer here and let us to correct when you make a mistake. Good luck :)
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Postby Aerlinn » Thu Feb 09, 2006 9:30 am

Ok, this is my go at the answer, not sure if its correct though.
In fresh water, there are more free water molecules, making the concentration gradient higher, so water diffuses in when you inhale it, more rapidly... but in salt water, there are not so many free water molecules, therefore there is less of a concentration gradient... so water doesnt get in as quickly... ?
But the salt concentration in sea water, would that be more or less than in us? I'm not even sure we even have salt in us... can water diffuse out our lungs into sea water, or is that not possible?
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Postby Dr.Stein » Fri Feb 10, 2006 7:06 am

We HAVE salt in our body fluids, in concentration 0,09 % ;)

You can make a fluid isotonis with our body liquid by mix NaCl (pure) with distilled water and heat as 37 oC, it is called as "Physiological Saline" :)
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Postby sdekivit » Fri Feb 10, 2006 8:47 am

Dr.Stein wrote:We HAVE salt in our body fluids, in concentration 0,09 % ;)

You can make a fluid isotonis with our body liquid by mix NaCl (pure) with distilled water and heat as 37 oC, it is called as "Physiological Saline" :)


body fluid salt concentration is 0,9 % NaCl ;) not 0,09% (physiological salt solution)
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Postby Dr.Stein » Fri Feb 10, 2006 10:38 am

sdekivit wrote:
Dr.Stein wrote:We HAVE salt in our body fluids, in concentration 0,09 % ;)

You can make a fluid isotonis with our body liquid by mix NaCl (pure) with distilled water and heat as 37 oC, it is called as "Physiological Saline" :)


body fluid salt concentration is 0,9 % NaCl ;) not 0,09% (physiological salt solution)

Oops sorry I am sure this it the time for me to change my keyboard. Last time it types more "a" and then too many "enter" and now too many "0" :twisted: :oops: That's what I mean. Thanks for correction ;)









*throws the keyboard away* :lol:
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Postby victor » Fri Feb 10, 2006 10:47 am

I think I've given the answer for this question....back then, someone PM me and ask this question..I think the name is "thetuuch"...:?
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Postby Aerlinn » Sat Feb 11, 2006 11:45 am

So, the salt concentration in us makes a difference?

I think I've given the answer for this question....back then, someone PM me and ask this question..I think the name is "thetuuch"...

Really? Do you remember what you wrote?
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Postby victor » Sat Feb 11, 2006 12:24 pm

Taken from my sentbox:
I think it's due to hemolysis and crenation of RBC...From you statement, my opinion is because of the osmosis mechanism and I see that Hemolysis cause death faster than crenation.
Next time, post your question on the related forum...PM is only used in bilateral chat...
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Victor


Now I'll add a little...drowning in sea water force you to drink much of sea water. Means that too many water will affect your electrolyte equilibrium and to much of Na+ ion inside the blood vessels will force the water from tissue to the vessels (because of diffusion). So, crenation of tissues occur isn't it?
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