MechANISM RestIng CondItIOns Flashcards Preview

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Flashcards in MechANISM RestIng CondItIOns Deck (15):
1

normal lung mean intrapleural pressure before inspiration

-5 cm H2O
- FRC

2

recoil force

= +5

3

alveolar pressure

= 0 atm pressure

4

during inspiration

- diaphragm will pull the lung downwards
- causing an increase in thoracic volume causing decrease in the pressure in the thorax causing

5

the more the negative the intrapleural pressure

- the more it expands the lung

6

dynamic state

- no expansion
- no collapse
- lung is inflated
- alveolar pressure
- flow stops

7

pressure is inverse to

- volume

8


greatest airflow into the alveolus

- mid inspiration
- greatest pressure gradient

9

alveolar pressure 0--> (-1 ) -->0 at the end of inspiration any pathology that decreases the ability to develop negative alveolar pressure can be referred to

- RESTRICTIVE DISEASE
- lost of ability to develop negative alveolar pressure
- no gradient , no flow
eg. fibrosis, asbestosis, siliconosis, sarcoidosis (OSIS to restrict)

10

at the end of deep inspiration

- alveolar pressure 0 zero

11

patient with PULMONARY FIBROSIS

- lose the ability to develop negative alveolar pressure

12

expiration

- relax diaphragm
- lose volume
- pressure increase
- intrapleural pressure from -8 to -5
- recoil force collapse of the lung form 0 pressure to +1
reason for air leaving the alveolus

13

any pathology that decrease the ability to develop positivity pressure

- obstructive disease
- e.g. EMPHYSEMA classic, asthma, chronic bronchitis, COPD
- BARREL LUNGS

14

during inspiration intrapleural pressure

- becomes more negative
- form -5 to -8cm H2O

15

- 1

- greatest alveolar pressure cm H2O
- greatest air flow to alveolus