MEDICAL
KIDNEY
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Detailed explanation-1: -The kidneys are two bean-shaped organs, each about the size of a fist. They are located just below the rib cage, one on each side of your spine. Healthy kidneys filter about a half cup of blood every minute, removing wastes and extra water to make urine.
Detailed explanation-2: -Thus, we assume that the reason we have two kidneys is so that there is some extra reserve of kidney mass in case we sustain some renal insult (e.g. toxic injury, or traumatic injury). Having said that, about 1 in 1000 individuals are born with one kidney (unilateral renal agenesis).
Detailed explanation-3: -Most people have two kidneys, but some only have one. There are three main reasons why this could be: A person is born with only one kidney. About one in 750 people is born with only one kidney.