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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: - Non endospermic or exalbuminous seeds are present in
- The primary cell wall of plant consists of
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- If there are 4 cells in anthers, what will the number of pollen grains?
Topics: Human Digestion and Breathing
(167)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Non endospermic or exalbuminous seeds are present in
- The primary cell wall of plant consists of
- Rough endoplasmic reticulum synthesises
- The soil erosion can be prevented by
- If there are 4 cells in anthers, what will the number of pollen grains?
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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