Respiration Lecture 04: Compliance, FRC, and Respiratory Volumes Flashcards Preview

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Flashcards in Respiration Lecture 04: Compliance, FRC, and Respiratory Volumes Deck (30):
0

2 forces that affect ability of lung to inflate

compliance + resistance

1

what causes heart sounds?

turbulence in the tube system

2

What happens when stretching force of lung is released?

elastic tissue springs back into rest position

3

minimal volume

minimum volume lungs can be at before they collapse

4

as you increase lung volume, is more or less pressure required to inflate further?

more

5

slope of pressure volume curve =

compliance

6

stiffening the lung _______ compliance

decreases

7

emphysema causes _____ compliance. Fibrosis causes ________ compliance

emphesema --> increased
fibrosis --> decreased

8

net compliance of lung =

lung elastic recoil + surface tension

9

lung hysteresis

lung pressure and volume shows inflation and deflation curves that follow different paths

10

elastic forces of chest wall work in _______direction of the lung

opposite

11

Negative pressure must be applied to chest wall for it to ______

decrease in volume

12

Must apply ________pressure for chest wall to expand

positive

13

natural resting point of chest

very large volume (occurs during pneumothorax)

14

Functional Residual Capacity

Rest position when all compliance forces are in balance. Includes air left over in lungs after reaching normal rest point.
FRC = Residual volume + expiratory reserve volume

15

airway pressure

pressure measured when looking at total respiratory system including lung AND chest wall. Depends on the combined elastic forces of the lung and chest wall

16

compliance of the respiratory system (Cr)

the result of the balance of the lung and chest wall compliance

17

A major factor in tidal volume and associated Ppl

compliance

18

How does compliance affect FRC?

Decreased lung compliance will decrease FRC and increase collapsing force by the lung.

19

Resting lung volume =

FRC

20

vital capacity

amount of expired when starting from maximum inspiration and ending at maximum active exhalation

21

total lung capacity

vital capacity + residual volume

22

Which muscles are used above, at, and below FRC?

above - diaphragm
at- none
below - abd. muscles

23

inspiratory capacity

how much you can inhale starting from FRC

24

expiratory reserve volume

air you can actively expel out beyond FRC

25

What is net force for chest wall pulling out and lungs pulling in at residual volume?

pull out (chest wall wins over lungs)

26

What is net force for chest pulling out and lungs pulling in at FRC?

net force = 0

27

what is net force for chest pulling out and lungs pulling in at end of tidal breath (end of normal inspiration)?

net collapsing force

28

What is net force for chest pulling out and lung pulling in at 70% TLC?

net collapsing force, airflow out of lung

29

What is net force of chest pulling out and lung pulling in at TLC?

Huge collapsing force. Both chest wall AND lungs want to collapse

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