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B
pH in blood
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C
O2 level in blood
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D
O2 level and pH in blood
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Solution
The correct option is BCO2 level in blood The rate of breathing is controlled mainly by CO2 level in blood. The partial pressure of carbon dioxide (PCO2) controls the respiratory rate. The respiratory centre measures the levels of carbon dioxide, oxygen and acidosis in the arterial blood and sends message accordingly. If the carbon dioxide levels in the blood increases, the rate and depth of breathing increases.