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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: - Smallest bacterium is
- Which is near to the plasma membrane
- In which of the following interactions both partners are adversely affected ?
- Five kingdom of classification suggested by RH whittaker is not
- Which one of the following is NOT a characteristic of phylum Annelida?
Topics: Human Digestion and Breathing
(167)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Smallest bacterium is
- Which is near to the plasma membrane
- In which of the following interactions both partners are adversely affected ?
- Five kingdom of classification suggested by RH whittaker is not
- Which one of the following is NOT a characteristic of phylum Annelida?
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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