Body systemsQuestion 793 of 1700
What mainly drives the need to breathe?
- A lack of nutrients in the blood
- A fall in body temperature
- Rising carbon dioxide levels
- A stomach that feels very full
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Correct answer: Rising carbon dioxide levels
A build-up of carbon dioxide, not a need for oxygen, mainly triggers the urge to breathe.
Source: Nursing Assistant (Reuter), 11.10: Respiratory System
Questions last reviewed: 18 October 2026