Question

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)` concentration
B. Falling `CO_(2)` concentration
C. Rising `CO_(2)` and falling `O_(2)` concentration
D. Falling `O_(2)` concentration

Answer 1

Correct Answer - a
Rise in `CO_(2)` concentration is deteced by chemosensitive area activates inspiratrory centre in medulla oblongata , which lead to urge of breathing . Role of `CO_(2)` concentration is non signigifcant.