MechANISM RestIng CondItIOns

Question 1

normal lung mean intrapleural pressure before inspiration

Answer 1

• 5 cm H2O

- FRC

Question 2

recoil force

Answer 2

= +5

Question 3

alveolar pressure

Answer 3

= 0 atm pressure

Question 4

during inspiration

Answer 4

• diaphragm will pull the lung downwards

- causing an increase in thoracic volume causing decrease in the pressure in the thorax causing

Question 5

the more the negative the intrapleural pressure

Answer 5

• the more it expands the lung

Question 6

dynamic state

Answer 6

• no expansion
• no collapse
• lung is inflated
• alveolar pressure
• flow stops

Question 7

pressure is inverse to

Answer 7

• volume

Question 8

greatest airflow into the alveolus

Answer 8

• mid inspiration

- greatest pressure gradient

Question 9

alveolar pressure 0–> (-1 ) –>0 at the end of inspiration any pathology that decreases the ability to develop negative alveolar pressure can be referred to

Answer 9

• RESTRICTIVE DISEASE
• lost of ability to develop negative alveolar pressure
• no gradient , no flow
  eg. fibrosis, asbestosis, siliconosis, sarcoidosis (OSIS to restrict)

Question 10

at the end of deep inspiration

Answer 10

• alveolar pressure 0 zero

Question 11

patient with PULMONARY FIBROSIS

Answer 11

• lose the ability to develop negative alveolar pressure

Question 12

expiration

Answer 12

• relax diaphragm
• lose volume
• pressure increase
• intrapleural pressure from -8 to -5
• recoil force collapse of the lung form 0 pressure to +1
  reason for air leaving the alveolus

Question 13

any pathology that decrease the ability to develop positivity pressure

Answer 13

• obstructive disease
• e.g. EMPHYSEMA classic, asthma, chronic bronchitis, COPD
• BARREL LUNGS

Question 14

during inspiration intrapleural pressure

Answer 14

• becomes more negative

- form -5 to -8cm H2O

Question 15

• 1

Answer 15

• greatest alveolar pressure cm H2O

- greatest air flow to alveolus