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QUESTION
Q88) Increased in CO2 concentration shall cause ... [ AFMC 2008 ]

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As a general rule, the faster and deeper you breathe, the greater is the air exchange happening in your lungs. This means there is increase in the rate of oxygen uptake by blood and also of carbon dioxide wash-out. So if you breathe fast and deep, that will clear out maximum amount of carbon dioxide from your blood. Hence a decrease in blood CO2 concentration.
Answer : (c)