Amechanical ventilator may aid directly in pulmonary ventilation. external respiration. internal respiration. pulmonary ventilation and external respiration are correct. pulmonary ventilation, external respiration, and internal respiration are correct.

a. pulmonary ventilation

Explanation:

A mechanical ventilator is used in times of respiratory failure it helps air flow in and out of the lungs to assist in breathin. It's an important breathing aid in terms of emergency.

Pulmonary ventilation is another name for breathing. It involves air flow into the lungs and out of the lungs.