In which of the following types of ventilation is alveolar expansion during inspiration due to an increase in alveolar pressure?
I.negative-pressure ventilation
II.positive-pressure ventilation
III.spontaneous ventilation

Question

Quizplus · Accepted Answer

In positive-pressure ventilation, alveolar expansion during inspiration is due to an increase in pressure created by the mechanical ventilation, while in spontaneous ventilation, alveolar expansion is due to the contraction of the diaphragm and other respiratory muscles. In negative-pressure ventilation, alveolar expansion is due to a decrease in pressure surrounding the lungs, which causes air to flow in. Therefore, the only type of ventilation where alveolar expansion during inspiration is due to an increase in alveolar pressure is positive-pressure ventilation, making option C the correct choice.

In Which of the Following Types of Ventilation Is Alveolar