ANIMAL PHYSIOLOGY
OSMOREGULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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will thrive under such conditions, as long as he has lived at the ocean most of his life.
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will excrete more water molecules than taken in, because of the high load of ion ingestion.
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will find that drinking saltwater satiates his thirst.
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will risk becoming overhydrated within 12 hours.
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Detailed explanation-1: -isoosmotic. seawater in a tidal pool. drink seawater and secrete excess ions mainly through their nasal salt glands. will excrete more water molecules than taken in, because of the high load of ion ingestion.
Detailed explanation-2: -Human kidneys can only make urine that is less salty than salt water. Therefore, to get rid of all the excess salt taken in by drinking seawater, you have to urinate more water than you drank. Eventually, you die of dehydration even as you become thirstier.
Detailed explanation-3: -Desalination is the process by which the dissolved mineral salts in water are removed. Currently, this process, applied to seawater, is one of the most used to obtain fresh water for human consumption or agricultural purposes.
Detailed explanation-4: -If you drank seawater, the salt would get absorbed into your blood along with the water . That would make your blood too salty. So, your kidneys would have to remove the salt. But to do that they would need to use even more water!
Detailed explanation-5: -Humans cannot drink saline water, but, saline water can be made into freshwater, for which there are many uses. The process is called “desalination", and it is being used more and more around the world to provide people with needed freshwater.