How many kidneys does a normal person have?

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How many kidneys does a normal person have?



The kidney is an organ that removes waste from the body. All vertebrates and some invertebrates have kidneys. They are also important for regulating electrolytes. Human kidneys are 10-12 cm long and we have one on the left, and one on the right. Although the body has two kidneys, it is entirely possible to survive with just one. Thus, having two is a kind of 'double-insurance' which makes the body able to survive in case one kidney suddenly fails.


Answer time 0s (0s). 90% have previously answered correct on this question. The question was created 2008-11-21.