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) falling C$O_{2}$ concentration

(b) rising C$O_{2}$ and falling $O_{2}$ concentration

(c) rising C$O_{2}$ concentration

(d) falling $O_{2}$ concentration

Answer: (c)

Chemoreceptors in the medulla get stimulated by increase in $CO_{2}$ concentration in the blood of arteries. Decrease in $O_{2}$ concentration has no significant effect on chemoreceptors.

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