Navigate

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.

AIPMT2015
admin:

Related Questions

  1. The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is
  2. If %age of cytosine is 18%, then %age of adenine will be
  3. The process by which there is inhibition of glycolysis by atmospheric O₂ is
  4. The Eyes of the potato tuber are
  5. Plant cells differ from animal cells in having