The rise in CO2 concentration stimulates chemoreceptors present in the aorta and carotid artery, which stimulates the respiratory centre. The respiratory centre is not directly sensitive to oxygen concentration & hence desire to breathe is induced by rising in CO2 the concentration of blood.
When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
NEET UG 2015 — Zoology Breathing and Exchange of Gases
2015mcqeasy
When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
Official previous-year question
Held on 30 Apr 2015 · Verified 9 Jul 2026.
Options
- A
Falling O2 concentration
- B
Rising CO2 concentration
- C
Falling CO2 concentration
- D
Rising CO2 and falling O2 concentration
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