Physiology 2

Question 1

What are the two equasions to do with lung capactiy

Answer 1

Respiritory minute volume = tidal volume (streangth) * respiritory rate (frequency)

Alveolar ventelation = (tidal volume - dead space) * respiritory rate

Question 2

What is dead volume

Answer 2

Dead volume = air left in the conduciton zone -> never participates in gas exchange

Question 3

What is daltons law

Answer 3

The pressure of air = the sum of the partial pressures of components

Question 4

How does the pressure of gas change throughout breath

Answer 4

Nitrogen = no change
O2 = high atm = lower in alveolar = slightly higher when breathed out
CO2 = low atm = high in alveolar = slightly lower when breathed out
H2O = low atm = high alveolar + breathed out

Question 5

What are the three factors impacting diffusion at respiritory membranes

Answer 5

surface area
thickness of walls
pressure difference (alveolar -> capillary)

Question 6

How does surface area affect gas exchange

Answer 6

alveolar bulbous shape = high SA = good gas exchnage

emphysema = dilation + destruction of alveolar walls = lower SA

Question 7

How does wall thickness affect gas exchange

Answer 7

Thinner wall = easier diffusion
blood air barrier = thin = easy diffusion

pulmonary fibrosis = thickened walls = harder diffusion

Question 8

How does pressure difference effect gas exchange

Answer 8

Bigger difference = better exchange
variable differe