Name the volume or capacity in each description…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Name the volume or capacity in each description.
- The air that moves in and out in one normal quiet breath.
- The extra air that can be pushed out after a normal expiration.
- The air still in the lungs after a normal expiration.
- The air that stays in the lungs after the strongest expiration.
- The largest volume that can be breathed out after the deepest breath in.
Need a reminder? The key ideaShow
, , , , . A spirometer cannot show the residual volume, because that air stays in the lungs.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Tidal volume (TV).
Step 2. (b) Expiratory reserve volume (ERV).
Step 3. (c) Functional residual capacity (FRC), which is ERV + RV.
Step 4. (d) Residual volume (RV).
Step 5. (e) Vital capacity (VC).
Answer: (a) TV; (b) ERV; (c) FRC; (d) RV; (e) VC.
Watch out. After a normal expiration the lungs still hold the ERV and the RV. After a forceful expiration only the RV is left.
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