1. Resp Physiology Flashcards Preview

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Flashcards in 1. Resp Physiology Deck (19):
1

large airways

have cartilage, supply lobes and segments

2

small airways

no cartilage, held open by surroundings

3

inspiratory musc have to overcome what (2 things)?

elastic recoil of lungs and flow resistance of system

4

formula for compliance?

compliance = dV/dP (volume, pressure)

5

formula for resistance?

R = P1-P2/flow (driving pressure/flow)

6

resistance decr or incr as lung vol expands?

decr because lung tissue pulled open

7

most of resistance is in large or small airways?

large: due to decr cross-section

8

what force drives passive expiration?

Palv

9

why does flow limitation occur?

because airways are collapsible rather than rigid, there is a pressure at which they will collapse

10

If Pcrit = neg, what does that mean? what about Pcrit = pos?

if neg: airway is strong/supported, would need outside pressure to collapse
if pos: airway is collapsed, like putting a rubber band around it

11

why do airways have a tendency to collapse with exhalation?

Bernoulli effect

12

what is the formula for max possible flow?

Vmax = Pelastic-Pcrit/Rupstream

13

three ways to reduce Vmax

reduce lung elastic recoil (Pelastic)
incr Pcrit (rubber band)
incr R upstream with swelling, mucus, bronchitis

14

2 ways to incr residual volume

emphysema: lose elasticity. causes flow to end sooner, incr RV
asthma: incr Pcrit, flow decreases sooner, incr RV

15

interstitial lung disease: inc or decr lung tissue elastic recoil?

incr.

16

emphysema: inc or decr lung tissue elastic recoil?

decr.

17

fluid-filled lung: incr or decr surface forces at alveoli?

decr

18

surfactant deficiency: incr or decr surface forces at alveoli?

incr

19

why is breathing at low lung volumes mechanically disadvantageous?

incr resistance at low volumes