# West Resp Physio 9th Ed Flashcards

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1
Q

Smallest airways without alveoli

A

Terminal bronchioles

2
Q

Average volume of anatomic dead space

A

150 mL

3
Q

On average erythrocytes spend how much time in pulmonary capillary network?

A

0.75 seconds

4
Q

Volume of respiratory zone of lung

A

2.5-3 liters

5
Q

Methods of measuring total lung capacity, FRC or residual volume

A

Helium dilution technique, helium is insoluble in blood. Body plethysmograph.

6
Q

Equation for measuring FRC with helium dilution technique

A

C1V1 = C2(V1+V2), solve for V2

7
Q

Diffusion described by Fick’s Law

A
```Diffusion ~ D * (P1-P2) * A/T
D diffusion constant
P1 partial pressure
P2 partial pressure
A area
T thickness```
8
Q

Area of blood gas barrier in lungs

A

50-100 square meters

9
Q

Thickness of blood gas barrier in lung

A

0.3 micrometers

10
Q

Normal value of diffusing capacity for carbon monoxide at rest

A

25 mL/min/mmHg, increases 2-3 times with exercise

11
Q

How much faster is CO2 diffusion through tissue than O2?

A

20 times because of higher solubility

12
Q

Diffusion constant is proportional to

A

Solubility of gas

13
Q

Diffusion constant is inversely proportional to

A

Square root of molecular weight of gas

14
Q

Equation for diffusing capacity of lung for carbon monoxide

A

DL = VCO / PACO
VCO volume of carbon monoxide
PACO alveolar partial pressure of carbon monoxide

15
Q

Four causes of hypoxemia

A

Hypoventilation
Shunt
V/Q mismatch
Diffusion limitation

16
Q

Normal pH of CSF

A

7.32

17
Q

Ventilation increases by how liters per minute for each 1 mmHg rise in PCO2

A

2-3 liters per minute