Lecture 3 Flashcards
Why is there residual air in the lungs?
To keep the alveoli partially inflated as it takes too much energy to inflate them completely. Also it allows gas exchange to happen continuously.
What is a volume of air?
The amount of air moved in one movement
What is a capacity of air?
When volumes of air are added together they are called a capacity
What is vital capacity?
The max air that a person can inhale in one go
What is tidal volume?
The volume of air breathed in and out of the lungs at each breath
What is ERV?
Expiratory reserve volume is the maximum volume of air that can be expelled from the lungs at the end of a normal expiration
What is FRC?
Functional residual capacity is the ERV plus the residual volume
What is inspiratory capacity?
Tidal volume plus inspiratory reserve volume
What is IRV?
Inspiratory reserve volume is the max air that can be drawn into the lungs at the end of normal inspiration
Define pulmonary ventilation
Total air movement into/out of the lungs
Define alveolar ventilation
Fresh air getting to alveoli and therefore available for gas exchange
How much air is always in a persons dead space?
150ml
How do you find how much air is getting to the alveoli?
Subtract 150ml from the tidal volume
Define partial pressure
The pressure of a gas in mixture of gases is equivalent to the percentage of that particular gas in the entire mixture multiplied by the pressure of the whole gaseous mixture
