Question

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Book: Introduction to Anatomy and physiology

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Q: In your dream, you are floating on a raft in the middle of the ocean. The sun’s hot, you are very thirsty, and you are surrounded by water. You want to take a long, cool drink of sweater, but something you learned in anatomy and physiology stops you from drinking and saves your life! Why shouldn’t you drink sweater?

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Answer 1

Sea Water contains greater amount of salts than in our body fluids.

Fluids follow the simple law of osmosis according to which it flows from a region of its higher concentration to the region of its lower concentration.

Therefore, when you drink sea water it increases the osmolarity of the body fluids. As a result, water from cells of your body will move out to the body fluids following the concentration law.

As you are stranded in the ocean on a sunny day, the already dehydrated cells of your body will further get dehydrated due to water exit.  

Also to counter the increased salts in plasma, more urine will be produced to excrete the extra salts.

Due to extreme dehydration seizures, delirium, unconsciousness will set in along with kidney failure leading ultimately to death.