Read before you practise · 4 min
Read the Brainstem Controls of Breathing
Brainstem centres adjust breathing rhythm to chemical signals and changing oxygen availability.
NSEB · Breathing and Exchange of Gases · 4 linked questions · 100% coverage
Know this first
Respiratory Regulation is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Study deeper: NCERT Biology · Breathing and Exchange of Gases
Centres and receptors
The medullary respiratory rhythm centre generates the basic rhythm. The pontine pneumotaxic centre moderates inspiration. Peripheral chemoreceptors lie in carotid and aortic bodies; central chemosensitivity responds mainly to CO2/H⁺ changes.
Respond to altitude
At altitude, lower atmospheric PO₂ rapidly stimulates ventilation and cardiovascular responses that improve oxygen uptake and delivery.
OlympIQ exam lens
- ✓Medulla: primary rhythm generation.
- ✓Pons: moderates inspiration and tidal volume.
- ✓Carotid/aortic bodies: peripheral chemoreceptors.
- ✓Altitude: ventilation and heart rate rise.
OlympIQ trap
The central chemosensitive area is not primarily an oxygen sensor.
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