Lung Volumes Flashcards
1
Q
Inspiratory Reserve Volume (IRV)
A
The volume of air you breathe in after (on top of/in addition to) the tidal volume
2
Q
Expiratory Reserve Volume (ERV)
A
- The volume of air you can force out in addition to the VT
- Requires activation of expiratory muscles (active expiration)
3
Q
Residual volume
A
- No matter how hard you try, you cannot voluntarily force the air
- “Having the wind knocked out of you”-something forced you to exhale into RV
4
Q
The Respiratory Capacities
- What is a capacity?
- How many are there?
A
- A capacity is the sum of two or more of the respiratory volumes
- There are four capacities
5
Q
The Respiratory Capacities
- Influenced by?
- Absolute volume compared to % of predicted?
- % predicted based on?
A
- Size, gender, and age
- Absolute volume is less important than % of predicted
- % predicted is based on population norms and regression analysis
6
Q
Vital capacity
A
- Inhale as deeply as you can then exhale all the air that you can (force it out at the end)
- VC = IRV + VT + ERV
7
Q
Vital capacity
-Does not include residual volume allows VC to be measured via?
A
Spirometry
8
Q
Inspiratory capacity
A
- Inhale as deeply as you can
- The total volume of air you can inhale from a normal resting point
- IC = IRV + VT
- Does not include RV-can be measured using spirometry
9
Q
What volume cannot be measured using spirometry?
A
Residual volume
10
Q
Functional Residual Capacity
A
- All the air that remains in your lungs at the end of a normal (passive) respiration
- FRC = ERV + RV
- INCLUDES RV so it CANNOT be measured using spirometry
11
Q
Total Lung Capacity
A
- The total volume of air in your lungs after a maximal inhalation
- TLC = ERV + RV + IRV + VT
- INCLUDES RV-CANNOT be measured using spirometry
12
Q
VC (vital capacity) equation?
A
VC = ERV + IRV + VT
13
Q
IC (inspiratory capacity) equation?
A
IC = IRV + VT
14
Q
FRC (functional residual capacity) equation?
A
FRC = ERV + RV
15
Q
TLC (total lung capacity) equation?
A
TLC = ERV + IRV + VT + RV
