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BIO NMDCAT Receptors
nmdcat.online July 7, 2026

The receptors that specifically monitor the oxygen tension (PO2​) in arterial blood are strategically located in the

A. Medulla oblongata
B. Aortic and carotid bodies
✓
C. Pulmonary veins
D. Right atrium

📝 Explanation

Peripheral chemoreceptors located in the aortic arch and carotid bodies are highly sensitive to drops in arterial PO2​, triggering an increase in respiratory rate. Central chemoreceptors monitor CO2​ and pH, not O2​.

📖 Additional Information

  • Medulla oblongata
  • Aortic and carotid bodies
  • Pulmonary veins
  • Right atrium

Peripheral chemoreceptors located in the aortic arch and carotid bodies are highly sensitive to drops in arterial PO2​, triggering an increase in respiratory rate. Central chemoreceptors monitor CO2​ and pH, not O2​.

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