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Flashcards in lung mechanics Deck (19):
1

how does a gas move

high to low P

2

what muscles are involved in inspiration

diaphragm, intercostals, accessory muscles (scalene and SCM)

3

what point are lungs at after normal exp.

FRC

4

muscles for forced expiration

abs and internal intercostals

5

function of pleaura (2)

1. transmit pressure
2. allow movement

6

what is typical pleural pressure at FRC

-5

7

when does pleural pressure become positive

forced expiration

8

what happens to lung volumes as pleural pressue become more neg.

volumes increase

9

what happens to alveolar elastic in emphysema and fibrosis

emphysema - destroyed
fibrosis - increased

10

formula for compliance

change in V/change in P

11

how does lung compliance change with volumes?

less compliant at very high or low volumes

12

what can create stiff chest wall

obesity, burns, binders, drugs, mulitrib fractures

13

what 3 things determine lung vol.

1. chest wall compl.
2. lung compliance
3. resp. muscle strength

14

what is formula for laPlaces law for spheres

P=(2xsurface tension)/radius

15

take away from laPlace

the smaller the radius, the higher the pressure -- gas wants out

16

what does surface tension on surfactant depend upon?

surface area

17

what is purpose of surfactant

helps stabilize the sphere size so doesn't get too big

18

** what are 3 purposes of sufactant

1. stabilizes small alveoli
2. less tension = less breathing work
3. keeps lungs dry

19

where in the lung are alveoli most compliant

at the base

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