resp 2 Flashcards
what equation describes flow from high to low?
F=deltaP/R
F-flow
deltaP- difference in pressure at 2 points
R-resistance
Dalton law
the total pressure exerted by a mixture of gases is the sum of the pressure exerted by each gas
Boyles law
P1V1=P2V2
helps explain how a change in lung volume results in a change in lung pressure
What is ventilation?
the bulk flow exchange of air between the atmosphere and the alveoli.
1 inspiration + 1 expiration
tidal volume x frequency of breathes = ToT Pulmonary ventilation
what are the 4 lung volumes?
- tidal volume
- inspiratory reserve volume
- expiratory reserve volume
- Residual volume
Tidal volume TV
the amount of air that enters or exits the lungs during quite respiration
-500ml
-normal breath
Inpiratory reserve volume IRV
the addition air that could be inspired aftyer tidal volume
-3000ml
-as much as you can
expiratory reserve volume ERV
the remaining air you can push out at the end of tidal volume
-as muych as you can
(no matter how hard u try u cant get rid of all of it)
Residual volume RV
the amount that is left in the lungs after maximal expiratory effort
-1200ml
-cannot be measured with spirometer
-prevents airway collapse by keeping some air
Name all 4 lung capacities
- Tot lung capacity
-the sum of all 4 volumes - Functional residual capacity
-the air remaining after quiet expiration (ERV + RV) - inspiratory capacity
-max amount of air that one can inspire after quiet respiration (IRV + TV) - vital capacity
-max air moved in one breath (IRV + TV + ERV)
what is the pulmonary function test?
tests ppls forced vital capacity (FVC)
inhale and exhale as much as possible to test for any restrications or obstructions
normaly forced exhaled is 80% of vital capacity (if below u have pulmonary disease)
