Physiology: Lung Volumes and Compliance Flashcards Preview

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Flashcards in Physiology: Lung Volumes and Compliance Deck (22)
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1

What is anatomical dead space ?

Volume of gas occupied by conducting airways and not available for gas exchange

2

What is the anatomical dead space equal too?

~150ml each

3

What is Tidal Volume?

TV - the volume of air breathed in and out of the lung in each breath

4

What is Expiratory Reserve Volume?

ERV - Maximum volume of air which can be expelled out the lungs at the end of of a normal expiration

5

What is Inspiratory Reserve Volume?

IRV - maximum volume of air which can be drawn into the lungs at the end of a normal inspiration

6

What is the Residual Volume?

RV - The volume of gas at the end of a maximal expiration

7

What is the Vital Capacity?

VC = Tidal Volume + Inspiratory Reserve Volume + Expiratory Reserve Volume

8

What is the Total Lung Capacity?

TLC - Vital Capacity + Residual Volume

9

What is the inspiratory Capacity?

IC - Tidal Volume + the inspiratory reserve volume

10

What is the Functional Residual Capacity?

FRC - Expiratory Reserve Volume + Residual Volume

11

What is the FEV1

Forced expired volume in 1 second

12

What is the FEV1:FVC?

Fraction of Forced Viral Capacity expired in 1 second

13

What is ventilation?

Movement of air in and out of the lungs

14

What is Pulmonary Ventilation?

Total movement of air in and out of the lungs

Measured in L/min

15

What is alveolar Ventilation?

Fresh air getting to the alveoli and therefore is available for gas exchange

Measured in L/min

16

What happens to ventilation in the sympathetic system?

Rapid breaths meaning less tidal volume and therefore less alveolar ventilation causing Hypo-ventilation

17

What happens to ventilation in the parasympathetic system?

Slower breaths causing a greater tidal volume causing an increase in alveolar ventilation and therefore Hyper-ventilation

18

What is Dalton's Law?

Total Pressure of a gas mixture is the sum of the pressures of the individual gases

19

What is the definition of Partial Pressure?

Pressure of gas in a mixture of gases is equivalent to the percentage of that particular gas in the entire mixture multiplied by the pressure of the whole gas mixture

Normally expressed in mmHg

20

What happens to the partial pressure of O2 and CO2 when ventilation is normal?

They remain fairly constant

21

What happens to Po2 and Pco2 during hyper-ventilation?

Po2 rises to 120mmhg
Pco2 falls to 20mmHg

22

What happens to Po2 and Pco2 during hypo-ventilation?

Po2 falls to 30mmHg
Pco2 rises to 100mmHg