A spirogram has these levels, measured from an empty lung: the lowest level, after a forceful…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A spirogram has these levels, measured from an empty lung: the lowest level, after a forceful expiration, is mL. A quiet expiration ends at mL, and a quiet inspiration ends at mL. The highest level, after the deepest breath in, is mL.
- Find the tidal volume.
- Find the expiratory reserve volume.
- Find the inspiratory reserve volume.
- Find the vital capacity.
- Find the total lung capacity.
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.
Given. Levels: , , and mL.
Plan. Subtract one level from another to get each volume.
Step 1. TV. mL.
Step 2. ERV. mL.
Step 3. IRV. mL.
Step 4. VC. mL.
Step 5. TLC. The highest level is measured from an empty lung, so TLC mL.
Answer: mL; mL; mL; mL; mL.
Check. mL, which is the highest level minus the lowest level. This also gives mL.
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