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If about 60 billion cells die by apoptosis in an adult human each day, roughly how many is that per second?

  • A.about 7,000
  • B.about 700,000
  • C.about 70,000
  • D.about 7 million

Answer: B

A day contains 86,400 seconds, and 60 billion divided by that is close to 700,000. Cell production must match this loss almost exactly for tissue size to stay constant. Turnover on this scale goes entirely unnoticed in a healthy body.

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