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Kidneys must excrete water in the urine so as to maintain homoeostasis in the body. The kidneys will excrete concentrated urine.

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โˆ™ 2014-08-21 11:39:41
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Q: Why must kidneys excrete water in the urine?
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Cool it!


Water moves out of the cells of a saltwater fish and into the ocean?

Diffusion is the way water moves out of the saltwater fish and into the ocean.Fish and aquatic animals have a complex task of Osmoregulation. Their bodies and especially the gills are bathed in either salt water with high salt levels for sea life, or freshwater with low salt levels for freshwater fish.The saltwater fish tend to keep saltier blood than freshwater fish. In some species, it essentially matches the environment.In the sea, some animals maintain essentially an isotonic solution between the blood and the salt water thus preventing osmosis into the ocean.Other ocean fish drink salt water, and actively pump sodium and chloride ions out of their gills to maintain the osmotic gradient.Freshwater fish have highly efficient kidneys to excrete lots of water and little salt. However, they still must expend energy to pump salt and ions into their bodies.Here is an excellent summary article:http://www2.hawaii.edu/~delbeek/delb11.html


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To clean a shower, you must remove a combinationformed by tap water and soap.THE END


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Some experiments use chemicals and water, glassware for such experiments must not be dried. But glassware for the experiments that has no water in them must be drived, so water do not get in the reaction. E.g. in Grignard reactions, if water gets in a reaction, alkane will be produce instead of an alcohol. You will get not what you wanted. But if you will perform Acid-Base Reactions, in the end you will get water anyway, so extra water that was in the glassware will not change anything.


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Related questions

Why must the kidneys excrete water in the urine?

to rid the body of bacteria acquired in kidneys and bladder


Why does eating salty foods makes us thirsty?

When the body has too much salt in it, the kidneys will excrete the excess salt into the urine, and they will also increase the amount of urine produced, in order to more easily flush out the excess salt. But to produce urine, the kidneys also need to obtain water from the blood, and the body must replenish its supply in order to avoid dehydration. Hence, you get thirsty.


How much water do fresh water fish drink?

None. Freshwater fish passively gain water across their skin and must actively excrete large quantities of water as very dilute urine.


Do you have to urinate?

Yes, you must urinate. Urine is continuously produced in your kidneys and stored in your bladder, and you must empty your bladder from time to time.


Do honey bee excrete?

Yes they do. If you eat, you must excrete.


Can water snails pee?

All animals must excrete waste including snails.


Can lupus nephritis cause dark urine and stabbing pains in kidneys?

it can cause dark urine. but some people have no overt symptoms of kidney disease which must be diagnosed by blood and urine tests.


How do fish excrete excess salt?

Because seawater is so salty, fish must pump out the excess salt. They do this through their kidneys and by using specialized cells in their gills.


List five waste products the body must excrete?

urine, feces, carbon dioxide,hormones,tears,sweat,salt, urea,fat..


What are the jobs of the kidneys?

The kidneys are in charge of processing the body's blood. Think of it like a filter. Without working kidneys, one must be on dialysis which processes the blood through a machine. ---- The 3 jobs of the kidneys are, Removal of Urea Proteins can't be stored, so the liver turns them into fats and carbohydrates.The Urea is the posionous waste from this process.It's removed by the kidneys and comes out in the urine or sweat. Taking lons out of the blood Lon like sodium need removing if there are too many of them in the bloodstream. The kidneys do this. Water Regualtion The amount of water that enters the bladder is controlled by the kidneys.


What are job of the kidneys?

The kidneys are in charge of processing the body's blood. Think of it like a filter. Without working kidneys, one must be on dialysis which processes the blood through a machine. ---- The 3 jobs of the kidneys are, Removal of Urea Proteins can't be stored, so the liver turns them into fats and carbohydrates.The Urea is the posionous waste from this process.It's removed by the kidneys and comes out in the urine or sweat. Taking lons out of the blood Lon like sodium need removing if there are too many of them in the bloodstream. The kidneys do this. Water Regualtion The amount of water that enters the bladder is controlled by the kidneys.


What are the problems of maintaining water balance for a freshwater fish and a seawater fish?

Freshwater fishes drink very little water and take in little water with their food. Marine fishes must conserve water, and therefore their kidneys excrete little water. To maintain their water balance, marine fishes drink large quantities of seawater, retaining most of the water and excreting the salt.

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