NEET MDS

The Power Course

Breathing air with CO2 more than 7% leads to



Choices

1 ) Increase in the depth of respiration
2 ) An increase in rate and depth of respiration
3 ) Decrease depth of respiration
4 ) A decrease in rate and depth of respiration

Explanation


Breathing air with CO2 up to 6% in healthy individuals increases the rate and depth of respiration. This is by an increase in alveolar PCO2 concentration leading to an increase in arterial PCO2 which stimulates respiration and increased rate and depth of respiration occurs. Increased respiration, reduces alveolar PCO2 concentration

When CO2 concentration in breathing air rises above the 7% increased rate and depth of respiration will not be able to reduce alveolar PCO2 concentration. This failure raises the blood level of CO2 leading to respiration depression and CO2 narcosis.


Answer

A decrease in rate and depth of respiration

Last Modified : 25-Dec-2019

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