How many kidneys does the average person have? How many kidneys does a person require to function? Is #1 the same as #2?
Kidney
Does an organ donor need to be dead to donate a kidney?
The average human has two kidneys. Only one kidney is required to function as a healthy person. Living organ donors will sometimes donate their spare kidney to someone experiencing failure of both their kidneys.
internal organ in most animals, including vertebrates and some invertebrates