Resp 3 Flashcards
when do secondary muscles become activated
forced inspiration or forced expiration
what are the secondary muscles activated during forced inspiration
sternocleidomastoids
neck and back muscles
upper respiratory tract muscles
what are the secondary muscles activated during forced expiration
abdominal muscles
internal intercostals
triangularis sterni
neck and back muscles
what pleura is attached to the sternum and diaphragm
parietal
what pleura is attached to the wall of the lungs
visceral
what drives the movement in volume in the lungs
the pressure change within the pleural fluid
what is the point of the sub atmospheric pressure in the pleural fluid
its important for holding the lungs open because of the natural recoil of the lungs
what is the wall of the lung drawn towards
negative pressure
What happens to intrapleural pressure during inspiration
Gets more negative
What do inspiratory muscles pull?
The parietal layer of the pleural away from the visceral layer
What layer in the pleural cavity moves more?
Parietal layer
What is pneumothorax
Collapsed lung
What is lung compliance
Stretchability of lungs / how easily they inflate
What is lung elastance?
The ability of the lung to resist being deformed
If there is high compliance, then there is ____ elastic recoil
Low
What is bad about high lung compliance?
They don’t want to recoil which makes it hard to breath out
What would it be like to have decreased lung compliance?
It would be hard to inspire
What would it be like to have increased lung compliance
It would be hard to expire
Does pulmonary fibrosis cause increased or decreased lung compliance?
Decreased compliance
What is pulmonary fibrosis?
Excess fibrous connective tissue in the lungs
Does emphysema cause decreased or increased compliance?
Increased compliance
What is emphysema?
Loss of capillaries and reduction of surface area
What’s the main cause of emphysema?
Cigarette smoking
What’s the major determinant of lung compliance and elastance?
Surface tension
