Final answer:
The total airflow would be significantly different if the pleural cavities are not intact compared to when they are intact.
Step-by-step explanation:
When comparing the total airflow in a trial where the pleural cavities are intact to one where they are not, there is typically a significant difference. The pleural cavity plays a crucial role in the mechanics of breathing. Normally, the space between the pleura (the membrane surrounding the lungs) and the chest wall is tightly sealed and filled with pleural fluid, which helps the lungs to expand and contract smoothly.
In the case of intact pleural cavities, the total airflow is maintained as the negative pressure within these cavities aids in the expansion of the lungs during inspiration. However, if the pleural cavities are compromised, such as by puncture or other damage that allows air to enter the pleural space, the delicate balance of pressures is disturbed.