What does mechanical ventilation primarily involve?

Mechanical ventilation primarily involves assisting or creating ventilation using devices. This process is crucial in situations where a patient is unable to breathe effectively on their own due to medical conditions like respiratory failure, unconsciousness, or certain neurological disorders. The devices used for mechanical ventilation, such as ventilators, can regulate the rate, rhythm, and volume of air that a patient receives, ensuring adequate oxygenation and carbon dioxide removal.

In contrast, the other options do not adequately capture the essence of mechanical ventilation. Natural breathing assistance through positioning may help improve a patient's breathing but does not constitute mechanical ventilation. Similarly, using oxygen tanks enhances the oxygen supply but does not aid in the mechanical process of venting air in and out of the lungs. Lastly, manual bagging, while a form of assisted ventilation, does not encompass the broader and more systematic approach that mechanical ventilators provide in managing a patient's breathing needs. Therefore, option C accurately reflects the comprehensive nature of mechanical ventilation.