Lecture 17: The work of breathing Flashcards
1
Q
A
2
Q
What is Tidal Volume?
A
Volume of air moved in and out during a normal quiet breath
3
Q
What is inspiratory reserve volume?
A
extra volume that can be inhaled over and above tidal volume
4
Q
what is expiratory reserve volume?
A
extra volume that can be exhaled voluntarily after completion of a normal, quiet respiratory cycle
5
Q
what is residual volume?
A
volume remaining in lungs after maximal exhalation
6
Q
what is minimal volume?
A
volume remaining in lungs if they collapsed
7
Q
what is vital capacity?
A
- Inspiratory reserve volume + expiratory reserve volume + tidal volume
- volume that can be moved in and out of your lungs
8
Q
what is total lung capacity?
A
- vital capacity + residual volume
- total volume in lungs when it is filled to maximum
9
Q
what is inspiratory capacity?
A
- inspiratory reserve + tidal volume
- total volume of air that can be inspired from rest
10
Q
what is functional residual capacity?
A
- expiratory reserve + residual volume
- volume remaining in lungs after normal exhalation
11
Q
what is the difference between restrictive and obstructive issues?
A
- Obstructive issues are a resistance to airflow. e.g. asthma or chronic bronchitis. A FEV1/FVC ratio lower than 0.70 indicates there is airway obstruction and therefore increased airway resistance
- Restrictive issues are a reduced lung capacity. e.g. fibrosis. This is because of reduced lung compliance or insufficient surfactant release. The FEV/FVC ratio will be the same as the lungs are still highly elastic
