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  • Try this! When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe ?

When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe ?

  • Option 1)

    falling CO2 concentration

  • Option 2)

    rising CO2 and falling O2 concentration

  • Option 3)

    falling O2 concentration

  • Option 4)

    rising CO2 concentration

 

Answers (1)

As learnt

Partial pressure of CO2 as compared to O2 -

As the solubility of CO2 is 20-25 times higher than that of O2, the amount of CO2 that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O2.

-

 

 AND

 

Carbon dioxide (CO2) -

Carbon dioxide (CO2) which is harmful is also released during the above catabolic reactions.

-

 

 Holding of breath will increase the amount of CO2 in blood.


Option 1)

falling CO2 concentration

This option is incorrect

Option 2)

rising CO2 and falling O2 concentration

This option is incorrect

Option 3)

falling O2 concentration

This option is incorrect

Option 4)

rising CO2 concentration

This option is correct

Posted by

Vakul

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