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Ventilation (concept problem),

  1. Dec 29, 2009 #1
    Ventilation (concept problem), plz help

    We breathe more fiercely when we do vigorous exercise. But what is the reason behind?

    (1) The medulla oblongata senses the increase in blood CO2 concentration.
    (2) The receptors in our skeletal muscles send nerve impulses to the brain.

    My textbook says (1) is the correct answer, but one of my reference books tells me otherwise...
  2. jcsd
  3. Dec 30, 2009 #2
    Re: Ventilation (concept problem), plz help

    It's the first.
    Dissolved CO_2 turns into carbonic acid and a decrease in pH alerts your medulla, which fundamentally alters breathing
    I'm not sure about the second one, but it would have to do with obtaining oxygen to produce the energy. I would still go with the first.
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