The human respiratory rate is regulated by chemoreceptors that monitor which of the following?
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Correct Answer: C. pH levels
The brain triggers the diaphragm to contract and lower to spur inhalation when the pH levels begin to drop. In the presence of high amounts of CO2, the blood’s pH begins to become acidic, which is detected by chemoreceptors. This will initiate inhalation, where CO2 will be expelled and oxygen will be absorbed into the capillaries in the alveoli, thereby restoring blood’s neutral pH.
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