Question

Pneumotaxic centre can moderate the functions of respiratory rhythm centre by

• A. Reducing the duration of inspiration
• B. Increasing the duration of inspiration only
• C. First increasing and then reducing the duration of expiration
• D. Increasing the duration of expiration only

Answer 1

The correct option is A Reducing the duration of inspiration

• Pneumotaxic centre controls the intensity of breathing, giving positive impulses to the neurons involved with inhalation.
• The apneustic centre is inhibited by pulmonary stretch receptors and also by the pneumotaxic centre.
• It also discharges an inhibitory impulse to the pneumotaxic centre.
• Hence, Pneumotaxic centre can moderate the functions of respiratory rhythm centre by Reducing the duration of inspiration.
• So, the correct answer is 'Reducing the duration of inspiration'.