A) Falling \[{{O}_{2}}\] concentration
B) Rising \[C{{O}_{2}}\] concentration
C) Falling \[C{{O}_{2}}\] concentration
D) Rising \[C{{O}_{2}}\] and falling \[{{O}_{2}}\] concentration
Correct Answer: B
Solution :
When we hold our breath, \[C{{O}_{2}}\] concentration rises and accumulates in blood and lungs, triggering impulses from respiratory centre part of brain. The body has the ability to detect rising \[C{{O}_{2}}\] levels and send signals to take a breath, so as to compensate the lowering levels of \[C{{O}_{2}}\]in blood and lungs. Gases diffuse from air to blood passively, i.e. from high concentration to low. When lungs become concentrated with same \[C{{O}_{2}}\] as in blood, it no longer leaves blood and keep rising till next breath. As one breathes in \[C{{O}_{2}}\] diffuses out of lungs and oxygen is taken in. Thus neutralizing the acidity caused by high \[C{{O}_{2}}\] levels.
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