EasyZoologyBreathing and Exchange of Gases
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Which gas is the primary driver for the urge to breathe in humans?
A
Decrease in O₂ concentration
B
Increase in CO₂ concentration
C
Decrease in N₂ concentration
D
Increase in O₂ concentration
Explanation
The primary stimulus for breathing in humans is an increase in CO₂ concentration (hypercapnia) in blood, which leads to increased H₂CO₃ (carbonic acid) and decreased pH. These changes are detected by central chemoreceptors in the medulla oblongata and peripheral chemoreceptors in the carotid and aortic bodies, triggering increased ventilation.
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