The respiratory center is very sensitive to changes in l_________evels, but not very sensitive to changes in _________levels.

Question

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The respiratory center is very sensitive to changes in carbon dioxide levels but not very sensitive to changes in oxygen levels. This is because a rise in carbon dioxide levels in the blood leads to a decrease in blood pH, which directly stimulates the respiratory center to increase breathing rate and depth to expel more CO2. Oxygen levels have to drop significantly before they stimulate an increase in respiration.

The Respiratory Center Is Very Sensitive to Changes in L_________evels