Ventilation and compliance 1 Flashcards Preview

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Flashcards in Ventilation and compliance 1 Deck (20):
1

Tidal volume

total volume of air breathed in and out of lungs in one breath

2

Inspiratory residue volume

Maximum volume of air which can be drawn into lungs at the end of normal inspiration

3

Expiratory residue volume

Maximum volume of air which can leave the lungs at the end of normal expiration

4

Residual volume

Volume of gas in the lungs after maximal expiration

5

Vital capacity

TV+ IRV +ERV

6

Total lung capacity

Vital capacity + Residual volume

7

Inspiratory capacity

Tidal volume + IRV

8

Functional residual capacity

ERV + Residual volume

9

Alveolar capacity vs pulmonary capacity

Pulmonary ventilation= total air movement in and out of lungs
Alveolar ventilation= fresh air which reaches the alveoli and therefore can be used for gaseous exchange

10

Partial pressure

Percentage of gas in a mixture multiplied by total pressure of mixture

11

Pressure of atmosphere/02

760mmhg
160mmhg

12

alveolar ventilation of 02 and CO2

normal ventilation
02= 100mmhg
C02= 40mmhg
Hypoventilation
02= 30MMHG
C02=100MMHG
hyperventilation
02=120mmgh
Co2=20mmhg

13

Anatomical dead space

Volume of conducting airways.
Gas inspired is exhaled unchanged.
About 150ml

14

Law of Laplace?

explains the difference in pressure between larger and smaller alveoli
P=2T/r
P is pressure
T is surface tension
r is radius

15

Law of Laplace in different sized alveoli and how the production of surfactant helps this

In alveoli
P will be greater in alveoli with smaller radii due to the law of Laplace
Surfactant helps decrease surface tension in the alveoli
More surfactant produced in smaller alveoli as the cells are closer together
T decrease in smaller alveoli.

16

Average volume in Tidal volume

500ml

17

Average ERV

1200ml

18

Average IRV

3000ml

19

Average RV

1200ml

20

Average Total Lung Capacity

TV+ IRV+ ERV +RV = 5000ml