Lung laws

Question 1

Define Dalton’s law?

Answer 1

Sum of partial pressure of gasses = total partial pressure

Question 2

Define Boyle’s law?

Answer 2

P1V1=P2V2
An increased volume decreases pressure
An increased pressure decreases volume

Applies during inspiration

Question 3

Define Poiseuille’s Law?

Answer 3

Laminar flow/resistance in tube dependent on radius of vessel and viscosity of fluid

Question 4

Define Henry’s law?

Answer 4

At higher pressure, insoluble gasses are more likely to dissolve
E.g. nitrogen in joints whilst diving

Question 5

Define Laplace’s law?

Answer 5

Wall tension is proportional to vessel radius for cylindrical vessels
Increased surfactant reduces surface tension

Question 6

What reduces surface tension?

Answer 6

Surfactant