Mechanics Of Breathing

Question 1

Boyles law

Answer 1

Pressure exerted by a gas is inversely proportional to its volume

Question 2

Daltons law

Answer 2

Total pressure of a gas mixture is the sum of the partial pressures

Question 3

Pleural membranes

Answer 3

Visceral next to lungs, parietal next to ribs

Question 4

Inspiration muscles

Answer 4

External intercostals and diaphragm

Question 5

Expiration muscles

Answer 5

Usually passive but can use internal intercostals and abdominals

Question 6

Intercostals motion

Answer 6

Pump handle action increases anterior posterior dimensions, bucket handle increases lateral dimension

Question 7

Pathophysiology of asthma

Answer 7

Overreactive constriction of bronchial smooth muscles. Increased resistance esp. In expiration

Question 8

Pa (alveolar)

Answer 8

Intrathoracic alveolar pressure, can be negative or positive in relation to atmospheric

Question 9

Pip

Answer 9

Intrapleural pressure inside pleural cavity, always negative in health

Question 10

Pt

Answer 10

Difference between Pa and Pip, always positive because Pip is always negative

Question 11

Pneumothorax

Answer 11

Collapsed lung, air enters pleural cavity because of the negative pressure