KROK 1 2010 – Question 149 · KROK (Medicine) · Physiology
Voluntary breath-holding caused increase of respiration depth and frequency. The main factor stimulating these changes of external respiration is:
- A. Decreased tension of CO2 in blood
- B. Decreased concentration of H⁺ in blood
- C. Increased tension of CO2 in blood
- D. Decreased tension of O2 in blood
- E. Increased tension of O2 in blood
Hint
Consider which chemical change develops during a breath-hold and most strongly drives the respiratory centre, and through which chemoreceptors.
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