Living off of one kidney?

QUESTION:
How can a person life off of one kidney? Is it possible?

ANSWER:
Some people are born with one kidney and others have kidney failure which can lead to the removal of a kidney. How are they able to function?

If a person only has one kidney, that kidney has to adjust and filter, normally what two kidneys would do. The nephrons compensate by growing larger in size, through a process called hypertrophy. They do this so they can handle all the liquid that they need to filter in just one kidney. Usually heathly person with one kidney will have no other effects. If a person is born without one kidney, the other kidney usually grows much larger (almost the size of two kidneys put together) in order to porperly do its job.

FACTS:
Being born with one kidney is more common in males.
Having one large kidney, is delicate and is more prone to injury.
Those enrolled in sports must take extra precautions and wear more padding.
Those with one kidney should have more doctors checkups.
Slightly higher blood pressure can result.
Frequent urine tests should be done.
Should take precautions when taking medicines (Advil, Tylenol, etc.)

WEBSITES:
http://www.scientificamerican.com/article.cfm?id=how-can-you-live-without
http://www.kidneyresearchuk.org/health/factsheets/ckd-and-issues/living-with-one-kidney.php