Flashcards in Ventilation and compliance 1 Deck (20):
total volume of air breathed in and out of lungs in one breath
Inspiratory residue volume
Maximum volume of air which can be drawn into lungs at the end of normal inspiration
Expiratory residue volume
Maximum volume of air which can leave the lungs at the end of normal expiration
Volume of gas in the lungs after maximal expiration
TV+ IRV +ERV
Total lung capacity
Vital capacity + Residual volume
Tidal volume + IRV
Functional residual capacity
ERV + Residual volume
Alveolar capacity vs pulmonary capacity
Pulmonary ventilation= total air movement in and out of lungs
Alveolar ventilation= fresh air which reaches the alveoli and therefore can be used for gaseous exchange
Percentage of gas in a mixture multiplied by total pressure of mixture
Pressure of atmosphere/02
alveolar ventilation of 02 and CO2
Anatomical dead space
Volume of conducting airways.
Gas inspired is exhaled unchanged.
Law of Laplace?
explains the difference in pressure between larger and smaller alveoli
P is pressure
T is surface tension
r is radius
Law of Laplace in different sized alveoli and how the production of surfactant helps this
P will be greater in alveoli with smaller radii due to the law of Laplace
Surfactant helps decrease surface tension in the alveoli
More surfactant produced in smaller alveoli as the cells are closer together
T decrease in smaller alveoli.
Average volume in Tidal volume