Question

The respiratory mechanism controlled by medulla oblongata can be altered by

• A. Both Pneumotaxic and Chemoreceptive areas of pons and medulla oblongata
• B. Corpus callosum of brain
• C. Pneumotaxic center in the pons
• D. Chemoreceptive area in the medulla

Hint:

The medulla oblongata’s respiratory control is modulated by pons and chemoreceptive feedback.

Answer 1

The Correct Option is A

• Respiratory Control: The medulla oblongata regulates basic respiratory rhythm, influenced by inputs from other brain regions.
• Region Analysis:
  • (1) Both Pneumotaxic and Chemoreceptive areas of pons and medulla oblongata: The pneumotaxic center in the pons fine-tunes breathing rate, while chemoreceptive areas in the medulla and pons detect CO2 and pH changes, altering respiration. This is correct.
  • (2) Corpus callosum of brain: Connects the two hemispheres, not involved in respiratory control. Incorrect.
  • (3) Pneumotaxic center in the pons: Modulates breathing but alone does not fully alter medullary control. Incorrect as it’s partial.
  • (4) Chemoreceptive area in the medulla: Detects chemical changes but works with pons areas for full regulation. Incorrect as it’s incomplete.
• Conclusion: The correct answer is (1), as both pneumotaxic and chemoreceptive areas collectively influence medullary respiratory control.