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Changes in CO2 and H+ ions concentration...

Changes in CO2 and H+ ions concentration of blood are detected by

A

receptors in pulmonary arteries

B

Aortic and certified chemoreceptors

C

Respiratory centres in pores

D

none of the above

Text Solution

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The correct Answer is:
To solve the question of which receptors detect changes in CO2 and H+ ion concentrations in the blood, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Question**: The question asks which receptors in the body are responsible for detecting changes in the concentrations of carbon dioxide (CO2) and hydrogen ions (H+) in the blood. 2. **Identifying Key Terms**: The key terms here are "CO2," "H+ ions," and "detected by." We need to focus on the physiological mechanisms that monitor these changes. 3. **Reviewing the Options**: - **Option 1**: Receptors in pulmonary arteries - These are not primarily responsible for detecting CO2 and H+ concentrations. - **Option 2**: Aortic and carotid chemoreceptors - These are specialized receptors that detect changes in blood chemistry, including CO2 and H+ levels. - **Option 3**: Respiratory centers - While they respond to changes in CO2 and H+, they are not the primary detectors; they integrate signals from chemoreceptors. - **Option 4**: None of the above - This option is incorrect since we have identified a correct option. 4. **Analyzing the Correct Option**: The aortic and carotid chemoreceptors are located in the carotid bodies (at the bifurcation of the carotid artery) and aortic bodies (near the aorta). These receptors are sensitive to changes in blood pH (which correlates with H+ concentration) and CO2 levels. 5. **Conclusion**: Based on the analysis, the correct answer to the question is **Option 2: Aortic and carotid chemoreceptors**.
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