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  • In the absence of respiration, which gas alteration in the bloodstream would primarily trigger the sensation of breathlessness?  <div class='qna-option

In the absence of respiration, which gas alteration in the bloodstream would primarily trigger the sensation of breathlessness?

 

Option: 1

Decreasing the concentration of \mathrm{CO_{2}}


Option: 2

Increasing the concentration of \mathrm{CO_{2}} and decreasing the concentration of \mathrm{O_{2}}


Option: 3

Decreasing the concentration of \mathrm{O_{2}}


Option: 4

Increasing concentration of \mathrm{CO_{2}}


Answers (1)

best_answer

The respiratory center of the brain is primarily stimulated by an excess of \mathrm{CO_{2}} leading to increased signals for inhalation and exhalation to the respiratory muscles. Oxygen \mathrm{(O_{2})} does not have a substantial direct impact on the respiratory center of the brain in regulating respiration. Hence, the correct answer is option 4.

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