2. Intrapleural pressure

[Editor]

a. can be measured with an oesophageal balloon
b. is related to diffusion of O2 into the intrapleural space
c. becomes increasingly negative with increasing lung volumes
d. equals atmospheric pressure at FRC
e. decreases with expiration against obstruction.

mark wrote:

a. can be measured with an oesophageal balloon
T
b. is related to diffusion of O2 into the intrapleural space
F
c. becomes increasingly negative with increasing lung volumes
F it will become +ve as being squashed
d. equals atmospheric pressure at FRC
At FRC, chest expansion, =lung recoil therefore T
e. decreases with expiration against obstruction.

F won\'t it increase

[aaswani]

(a) T
(b) F
(c) T - During inspiration intrapleural pressure becomes more negative. Static compliance curves give different information and should not be confused with this concept.
(d) F -Intrapleural pressure is equal and opposite to elastic lung recoil at FRC
(e) F - Intrapleural pressure becomes markedly positive during a cough or Valsalva manouvre