LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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One cup of sea water has enough sodium to poison you.
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Sea water is hypertonic to your cells and will only further dehydrate you.
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Sea water is too isotonic to your cells and you will absorb too much water.
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The salt will cause high blood pressure and you will die from a stroke.
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Detailed explanation-1: -Living cells do depend on sodium chloride (salt) to maintain the body’s chemical balances and reactions; however, too much sodium can be deadly. Human kidneys can only make urine that is less salty than salt water.
Detailed explanation-2: -At this desperate point in time, drinking your urine-and putting those pollutants back into your system-can cause a build-up of toxic levels. It’s for this same reason that it’s so dangerous to drink seawater.
Detailed explanation-3: -Urine is 95% water and 5% sodium, chloride, potassium and urea. Although that sounds promising, consider that sea water is 96.5% water and 3.5% sodium and chloride. Drinking urine will have the same effect that sea water does: It’ll dehydrate you further.
Detailed explanation-4: -As your kidneys continue to create excess urine to dilute the salt you will become severely dehydrated. This process will kill you if you continue to only drink salt water.
Detailed explanation-5: -Osmotic pressure is also the reason you should not drink seawater if you’re stranded on a lifeboat in the ocean; seawater has a higher osmotic pressure than most of the fluids in your body. You can drink the water, but ingesting it will pull water out of your cells as osmosis works to dilute the seawater.