5. CP Respiratory Cycle Flashcards
1
Q
What is the normal intrapleural pressure?
A
-5 cm H2O
2
Q
What is the average intrapleural pressure upon full, normal inspiration?
A
-8 cm H2O
3
Q
What is the alveolar pressure during inspiration?
A
-1 cm H2O
4
Q
How much does the volume of the lungs increase during a normal breath?
A
500ml (.5L)
5
Q
When are the expiratory muscles used?
A
During forced expiration only! Gentle inspiration is passive.
6
Q
What is the alveolar pressure at mid expiration?
A
+1 cm H2O
7
Q
How do we calculate minute ventilation?
A
Tidal volume x breaths per minute
8
Q
How do we calculate minute alveolar ventilation?
A
(Tidal volume - dead space) x breaths per minute
9
Q
How do we calculate transpulmonary pressure?
A
Alveolar pressure - intrapleural pressure
