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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: - Which of the following is not a characteristic feature of all chordates
- Which most often limits the primary productivity of the ecosystem?
- Mechanism of ATP production in aerobic respiration was given by
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Topics: Human Digestion and Breathing
(167)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which of the following is not a characteristic feature of all chordates
- Which most often limits the primary productivity of the ecosystem?
- Mechanism of ATP production in aerobic respiration was given by
- Lederberg and lederberg demonstrated that mutations are preadaptive. They used
- During the transmission of nerve impulse through a nerve fibre
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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