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Question

A man could hold his breath for more than 10 minutes. What do you think will be observed in the blood during his last minute of breath holding?
  1. Increased hematocrit
  2. All of the above
  3. Decreased partial pressure of carbon dioxide
  4. Decreased pH


Solution

The correct option is D Decreased pH
If a person holds his breath for longer period of time then it will result in a drop in oxygen as there is no intake of oxygen during this period. It will also lead to increase partial pressure of carbon dioxide because the cells continue to release carbon dioxide during metabolic processes. Now this increment in carbon dioxide will lead to its association with water to form carbonic acid in blood. Ultimately, this will result in decreased pH of the blood. 

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