Respiratory Mechanics - Karius Flashcards
1
Q
when does the elastic recoil of the lungs and rib cage exactly balance each other out?
A
at the FRC
2
Q
how does contraction of the bronchial affect resistance?
A
decreases radius, thus increasing Resistance
3
Q
what does a FEV1/FVC ration below 70% mean?
what is happening?
A
COPD (emphysema or asthma)
takes longer for air to get out of lungs
4
Q
what does a FEV1/FRC ratio above 95% indicate?
why?
A
interstitial fibrosis
elastic recoil of the lungs forces air out more rapidly
5
Q
what is interdependence
A
alveoli rely on each other to prevent their collapse
each recoil opposes another
6
Q
which work value is larger:
work of expiration or work done to stretch the lungs?
A
stretch the lungs
7
Q
what is hysteresis?
A
the difference between inspiration and expiration
