NEET Biology Breathing And Exchange Of Gases Based Practice Questions & Answers with Viewers Discussion and Detailed Explanation

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Breathing And Exchange Of Gases Topic Based

Question & Answer Discuss:

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

(a) Rising $CO_2$ and falling $O_2$ concentration

(b) Falling $CO_2$ concentration

(c) Falling $O_2$ concentration

(d) Rising $CO_2$ concentration

Answer: (d)

Excess $CO_2$ mainly stimulates the respiratory centre of the brain and increases the inspiratory and expiratory signals to the respiratory muscles. $O_2$ does not have a significant direct effect on the respiratory centre of the brain in controlling respiration.

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