Question by  apple (447)

Is urine sterile?

If it is, how can it be that human waste is sterile


Answer by  HH (404)

No. Since the urinary tract is necessarily open to the environment, the urethra is colonized constantly by bacteria. They attach to the walls and are similar to members of the normal skin flora. The flushing of the urinary tract is considered a valuable physical defense mechanism against microbial infection.


Answer by  PZ (1206)

Although urine contains waste products, it is considered sterile because it is generally free of bacteria. However, on the way out, urine typically picks up bacteria from the genital area.


Answer by  worker4642 (18)

Urine is sterile because it is passed through the kidneys. While kidneys function properly they remove any potential toxins. Your kidneys then slowly break down the toxins and excrete them as amonia.

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