Breathing Distribution

Question 1

Intrapleural pressure is more negative at the

Answer 1

Lung apices due to the effect of gravity

Question 2

Apical regions intrapleural pressure

Answer 2

Gravity pulls down on lungs more –> more neg Ppl –> stretch on alveoli –> alveoli more expanded at FRC

Question 3

Basal regions intrapleural pressure

Answer 3

Gravity has less pull on lungs –> less neg Ppl –> alveoli are less stretched –> alveoli are less open at FRC

Question 4

Lung compliance equation

Answer 4

Compliance = Volume/Pressure

Question 5

Closed alveoli are ___ compliance

Answer 5

Low

Question 6

Smaller alveoli are ___ compliance

Answer 6

High

Question 7

Well-opened alveoli are ___ compliance

Answer 7

Low

Question 8

Uppermost lung is

Answer 8

Non-dependent

Question 9

Lowermost lung is

Answer 9

Dependent

Question 10

Alveoli in non-dependent regions are

Answer 10

Stretched open at FRC by greater negative Ppl so they take less air in

Question 11

Alveoli in dependent regions are

Answer 11

Less stretched open at FRC as negative Ppl is less

Question 12

Compliance and ventilation in non-dependent regions

Answer 12

Less compliant and less ventilation

Question 13

Compliance and ventilation in dependent regions

Answer 13

More compliant and more ventilation