hile at the store, 4-year-old Bobby, in a fit of temper, started to hold his breath in an attempt to force his mom to buy him a new toy. His mother knew to not get too worried about her son's behavior. He would only be able to hold his breath for a limited amount of time, not enough to do him any harm. As Bobby held his breath, what changes in his blood gas values would be occurring? multiple choice 1Increase in PO2; increase in PCO2Increase in PO2; decrease in PCO2Decrease in PO2; decrease in PCO2Decrease in PO2; increase in PCO2 Which of these changes in blood gases will be the first to stimulate Bobby's respiratory system to start breathing again? multiple choice 2The change in PO2The change in PCO2
Question
hile at the store, 4-year-old Bobby, in a fit of temper, started to hold his breath in an attempt to force his mom to buy him a new toy. His mother knew to not get too worried about her son's behavior. He would only be able to hold his breath for a limited amount of time, not enough to do him any harm. As Bobby held his breath, what changes in his blood gas values would be occurring? multiple choice 1Increase in PO2; increase in PCO2Increase in PO2; decrease in PCO2Decrease in PO2; decrease in PCO2Decrease in PO2; increase in PCO2 Which of these changes in blood gases will be the first to stimulate Bobby's respiratory system to start breathing again? multiple choice 2The change in PO2The change in PCO2
Solution
When Bobby holds his breath, his body continues to metabolize oxygen and produce carbon dioxide. However, since he is not exhaling, the carbon dioxide cannot escape from his body and starts to build up in his blood. This leads to a decrease in PO2 (partial pressure of oxygen) and an increase in PCO2 (partial pressure of carbon dioxide). So, the answer to the first multiple choice question is "Decrease in PO2; increase in PCO2".
The respiratory center in the brain primarily responds to changes in PCO2 levels. When the PCO2 levels in the blood increase, it triggers the urge to breathe. Therefore, the answer to the second multiple choice question is "The change in PCO2".
Similar Questions
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