B7 L7

Question 1

Boyle’s Law

Answer 1

Volume and pressure are inversely related

Question 2

Contraction of Inspiratory MM

Answer 2

lungs expand
alveolar pressure decreases
air flows in

Question 3

Relaxation of Inspiratory MM

Answer 3

lungs recoil to original size
increases alveolar pressure
air expelled

Question 4

Compliance

Answer 4

change in volume per change in pressure

inversely related to elastance

Question 5

Equilibrium Point

Answer 5

where forces are equal and opposite
chest wall expansion balanced by lung collapsing
equal to FRC- no energy required to maintain volume

Question 6

Emphysema

Answer 6

loss of elastic fibers
compliance increased
harder to get air out
FRC increased

Question 7

Fibrosis

Answer 7

lungs lose compliance
greater collapsing force
harder to get air in
FRC reduced

Question 8

Surfactant

Answer 8

reduces surface tension
keeps lungs open
makes inspiration easier

Question 9

CO2 is always….

Answer 9

perfusion limited and diffusion limited
more permeable than O2
low gradient

Question 10

O2 is usually…

Answer 10

perfusion limited
can be diffusion limited in exercise
less permeable than CO2
high gradient

Question 11

High A-a gradient

Answer 11

something wrong with oxygen exchange

Question 12

A-a gradient

Answer 12

diff b/t arterial O2 conc and alveolar O2

Question 13

Fibrotic Diseases

Answer 13

increase distance between air and blood

reduces diffusion

Question 14

Physiologic Shunts

Answer 14

perfused alveoli with no ventilation

allows deoxygenated blood to enter arterial circulation