Pulmonary ventilation depends on how many pressures?

1. The pressures are atmospheric and two internal ones. 2. They are named together. 3. Pulmonary ventilation depends on three types of pressure, atmospheric, intra-alveolar and intrapleural. 4. So the answer is three. _Source: OpenStax 'Anatomy and Physiology 2e', Ch 22 'The Respiratory System'_