Physiology & Biochemistry · single question
A decrease in blood CO₂ (hypocapnia) will lead to which physiological change?
Show answer and explanation
Correct answer: C. Hypoventilation
- A. ❌ Increased respiratory rate would eliminate more CO₂ — opposite of compensation.
- B. ❌ Hyperventilation would further reduce CO₂ — worsening hypocapnia.
- C. ✅ Correct. Decreased CO₂ (hypocapnia) REDUCES the chemical drive to breathe (CO₂ is the primary respiratory stimulant). The response is HYPOVENTILATION — decreased rate and tidal volume — allowing CO₂ to re-accumulate toward normal.
- D. ❌ Increased tidal volume would further lower CO₂ — opposite of the compensatory response.
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