A student has a vital capacity of 4500 mL, a tidal volume of 500 mL and an inspiratory reserve…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A student has a vital capacity of mL, a tidal volume of mL and an inspiratory reserve volume of mL. Her total lung capacity is mL.
- Find her expiratory reserve volume.
- Find her residual volume.
- Find her functional residual 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. VC mL, TV mL, IRV mL, TLC mL.
Plan. Use VC to find ERV, TLC to find RV, and then add.
Step 1. ERV. mL.
Step 2. RV. mL.
Step 3. FRC. mL.
Answer: ERV mL, RV mL, FRC mL.
Check. All three are in the usual ranges of the textbook.
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