Intro Lung MechANICS

Question 1

inspiration

Answer 1

• diaphragm
• active process
• contraction of diaphragm
• process involved LUNG RECOIL and INTRAPLEURAL PRESSURE

Question 2

expiration

Answer 2

• passive process

- relaxation

Question 3

LUNG RECOIL

lung size is proportional to lung recoil

Answer 3

• force/tension that develop in the wall of the lung as the lung expands
• collapsing force

Question 4

intrapleural pressure

Answer 4

• pressure in the thin film of fluid between the lung and the chest wall
• subatmospheric pressure is NEGATIVE force expand the lungs
• subatmospheric pressure is POSITIVE force to collapse the lung

Question 5

intrapleural pressure

Answer 5

• is always NEGATIVE

- EXPAND THE LUNG

Question 6

intrapleural pressure > lung recoil NEGATIVE

Answer 6

= LUNG EXPANDS

Question 7

intrapleural pressure

Answer 7

= LUNG COLLAPSE

Question 8

intrapleural pressure = lung recoil EQUILIBRIUM, STABLE STATE

Answer 8

= LUNG SIZE CONSTANT