Class 11 Exam > Class 11 Questions > When you hold your breath, which of the follo...
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When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
- a)rising CO2 and falling O2 concentration
- b)falling O2 concentration
- c)rising CO2 concentration
- d)falling CO2 concentration
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
When you hold your breath, which of the following gas changes in blood...
The correct answer is C: Rising CO2 concentration.
When you hold your breath, the levels of gases in your blood start to change. The urge to breathe is triggered by the buildup of carbon dioxide (CO2) in your blood. Here's how it happens:
1. Oxygen (O2) supply: When you hold your breath, the oxygen concentration in your blood starts to decrease because you are not taking in fresh oxygen from the air.
2. Carbon dioxide production: As your body continues to function, it produces carbon dioxide as a waste product. This CO2 is transported in your blood.
3. CO2 buildup: As you hold your breath, the production of CO2 continues, but there is no fresh oxygen to remove it. This leads to a gradual buildup of CO2 in your blood.
4. Rising CO2 concentration triggers the urge to breathe: The increase in CO2 is detected by chemoreceptors in your brain, specifically in the medulla oblongata. These chemoreceptors are sensitive to changes in CO2 levels, and when the concentration becomes too high, they send signals to your respiratory muscles, telling them to contract and initiate breathing.
Therefore, it is the rising CO2 concentration in your blood that first leads to the urge to breathe when you hold your breath.
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When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?a)rising CO2 and falling O2 concentrationb)falling O2 concentrationc)rising CO2 concentrationd)falling CO2 concentrationCorrect answer is option 'C'. Can you explain this answer?
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