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When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
Options
(a) rising CO2 concentration
(b) falling CO2 concentration
(c) rising CO2 and falling O2 concentration
(d) falling O2 concentration
Correct Answer:
rising CO2 concentration
Explanation:
Chemorecepters in the medulla get stimulated by increase in CO₂ concentration in the blood of arteries. Decrease in O₂ concentration has no significatant effect on chemoreceptors.
Related Questions: - There is no DNA in:
- Guard cells help in:
- Rarely among angiosperms the pollen grain develops in embryo sac. This abnormally
- How many of the above statements are correct about reproduction
- Auxanometer is used to detect
Topics: Human Digestion and Breathing
(167)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- There is no DNA in:
- Guard cells help in:
- Rarely among angiosperms the pollen grain develops in embryo sac. This abnormally
- How many of the above statements are correct about reproduction
- Auxanometer is used to detect
Topics: Human Digestion and Breathing (167)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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