1060- Lung volumes and pressures

Question 1

intrapleural pressure

Answer 1

pressure between the two pleura

Question 2

transpulmonary pressure

Answer 2

the difference between alveolar pressure and intrapleural pressure

Question 3

sequence of events in normal expiration

Answer 3

1. nerves decrease firing to diaphragm and intercostals so the muscles relax
2. chest recoils
3. Intrapleural (PIP) pressure goes back towards pre-inspiration level
   Transpulmonary pressure decreases to pre-inspiration level
4. air in alveoli gets compressed
5. air flows out of the lungs due to reversed pressure difference