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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.
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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
- Identify the hormone with its correct matching of source and function:
- Hinge joint occurs between
- Which one of the following pairs of codons is correctly matched with
- In human beings, the second meiotic division in the ovum occurs
- Single membrane bound organelle is
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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