NEET UG BIOLOGY MCQ: BREATHING AND EXCHANGE OF GASES

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Patients with chronic lung disease and difficulty breathing often adapt to the high concentration of

{CO}_2

in their blood. The breathing centres stop responding to

{CO}_2

level. If such a patient has difficulty in breathing, medical personnel are reluctant to give the patient pure oxygen. Based on what you know about control of breathing, why do you think this is the case?

View answer and explanation

Correct option: C

Increased oxygen in the blood might slow or stop breathing.

Option C (Increased oxygen in the blood might slow or stop breathing) is correct because in chronically hypercapnic patients, the respiratory drive is primarily dependent on hypoxia, and administering pure oxygen can remove this drive.

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