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Category - Biology

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The human body regulates respiration based on the concentration of carbon dioxide in the blood and _______.
  1. Lactic acid in the blood
  2. Oxygen in the blood
  3. pH of the blood
  4. oxygen in the capillaries
  5. carbon dioxide in the alveolar sacs
Explanation
Answer: C, pH of the blood. Respiration is regulated based on the concentration of carbon dioxide and the pH of the blood.

Key Takeaway: The respiratory system helps regulate pH balance by speeding up or decreasing respiration rate based on the levels of carbonic acid in the blood. By regulating the levels of carbon dioxide (the source of carbonic acid) through gas exchange in the lungs, the system regulates overall blood pH.
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