Module 10 ML-6

Question 1

What are lung mechanics

Answer 1

physical interactions of the lungs, diaphragm, and chest wall during breathing and breath holding

Question 2

What is the work of breathing

Answer 2

the effort, metabolic cost, to expand lung volume, to move air, and sometimes quietly exhale

Question 3

The work of breathing is affected by two factors

Answer 3

lung compliance and airway resistance

Question 4

What does lung compliance refer to

Answer 4

stretchability

Question 5

Increased compliance makes…

Answer 5

the lung easier to inflate

Question 6

What substance in the alveoli increases compliance

Answer 6

surfactant

Question 7

What do water molecules want to do?

Answer 7

they want to bind with eachother

Question 8

What happens if you have no surfactant in the alevolii

Answer 8

it will collapse inward

Question 9

What does surfactant do?

Answer 9

increases compliance, makes it easier to expand volume and opposes collapsing surface tension from water

Question 10

asthma

Answer 10

bronchioles constrict and inflammation occurs

Question 11

emphysema

Answer 11

loss of normal elastic recoil causes airwyas to collapse prematurely and more work for exhaling

Question 12

Bronchities

Answer 12

inflammation and excessive production of mucua

Question 13

What is the normal cost of breathing

Answer 13

3% of total metabolism

Question 14

Cost of breathing with COPD

Answer 14

30%