Static Lung Mechanics

Question 1

What is compliance?

Answer 1

Volume pressure curve
Draw a tangent, take the gradient
C = delta V / delta P

Question 2

What are the approximate values for vital capacity?

Answer 2

4-6L

Question 3

What is the approximate value for tidal volume?

Answer 3

0.5L

Question 4

What are the approximate values for functional residual capacity?

Answer 4

2-3L

Question 5

How do you calculate minute volume?

Answer 5

Minute volume =
Tidal volume x Respiratory frequency

Question 6

What is the functional residual capacity made up of?

Answer 6

Expiratory reserve volume
Residual volume

Question 7

What is vital capacity made up of?

Answer 7

Inspiratory reserve volume
Tidal volume
Expiratory reserve volume

Question 8

What is total lung capacity made up of?

Answer 8

Inspiratory reserve volume
Tidal volume
Expiratory reserve volume
Residual volume

Question 9

What is tidal volume?

Answer 9

Normal quiet breathing

Question 10

Discuss factors affecting lung compliance

Answer 10

Lamellar bodies and surfactant secretion
Epithelial cells
Elastin fibres - elastic recoil of the lungs
Surface tension
Tension in alveolar walls
0.2micrometers diffusion distance