When you hold your breath, which of the following gas changes in blood would first lead

⇦

⇨

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:

1. The kidney is covered by a tough connective tissue capsule called
2. Desmosomes are found in
3. Among HIV viruses which one is more virulent causing AIDS in 90% of the cases
4. The important muscle proteins that help in movement are
5. Which hormone is maximum in coconut milk

Topics: Human Digestion and Breathing (167)
Subject: Biology (4253)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends