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Home Questions & Answers Science Biology Question Answers When you hold your breath, which of the followinggas changes in blood would first lead to the urge tobreathe?

    When you hold your breath, which of the following
    gas changes in blood would first lead to the urge to
    breathe?

  • rising CO2 concentration
  • falling CO2 concentration
  • rising CO2 and falling O2 concentration
  • falling O2 concentration

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