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    Ans: c
    Why is respiratory centre in the brain not stimulated by oxygen concentration in blood?

    According to the explanation above, respiratory rhythm centre is controlled by chemo-sensitive region in medulla which can sense only Pco2 & H+ ion conc in blood.

    Does respiratory rhythm centre itself have no receptors of Pco2, Po2 & H+ ions? Please explain.

  • @anag
    The respiratory center receives input from chemoreceptors, mechanoreceptors, the cerebral cortex, and the hypothalamus in order to regulate the rate and depth of breathing. Input is stimulated by altered levels of oxygen, carbon dioxide, and blood pH, by hormonal changes relating to stress, and anxiety from the hypothalamus, and also by signals from the cerebral cortex to give a conscious control of respiration.

  • @sunitasaxena But the answer does not have oxygen concentration in blood. Is the ans correct? Please explain.

  • @anag
    Since in option only CO2 given it is correct here.but it is due to CO2&o2both

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