L10: Lung Function

Question 1

1st step in respiration

Answer 1

Respiration: Movement of air in & out of lungs by bulk flow (down a diffusion gradient)

Question 2

2nd step of respiration

Answer 2

Exchange of O2 & CO2 between alveolar air & blood in lung capillaries by diffusion

Question 3

3rd step of respiration

Answer 3

Transport of O2 & CO2 through pulmonary & systemic circulation by bulk flow

Question 4

4th step of respiration

Answer 4

Exchange of O2 & CO2 between blood in capillaries & respiring tissues by diffusion

Question 5

5th step of respiration

Answer 5

Cellular utilisation of O2 & production of CO2

Question 6

How does air flow occur?

Answer 6

From a region of high pressure to a region of low pressure

Air flow is proportional to the different in air pressure

Question 7

Define ventilation

Answer 7

Flow of air in & out of lungs

Question 8

How to calculate total ventilation per minute (VE)??

Answer 8

Breathing rate (R) x Tidal volume (VT)

Question 9

What is the pressure difference between in lungs?

Answer 9

Atmospheric (Patm) & alveolar (Falv)

Question 10

Define Boyles Law

Answer 10

Pressure is inversely proportional to volume

• A change in volume induces a change in pressure

Pressure decreased - Volume increased
Volume decreased - Pressure increased

Question 11

What is the change in volume caused by?

Answer 11

Respiratory muscle