On these “Gold Standard Step 1 Facts” pages you will find Free:
- USMLE Audio Review files from our “Gold Standard USMLE Reviews”
- Transcriptions of those files
- And videos (as they become available)
The idea is that you can review for the USMLE online by:
- Listening to the Audio
- Following along with the transcription
- Or by watching the video (if available)
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Let’s start our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.
Play USMLE Audio MP3 60-09 Lung Capacities Below
Begin 60 09 Lung Capacities Transcription
Moving now to lung capacities.
List the four main lung capacities alphabetically. I’ll cue you for the acronym for each.
- functional residual capacity.
- Inspiratory capacity.
And third, TLC
- total lung capacity.
And fourth VC
- vital capacity.
For the next four questions, I’ll describe a lung capacity. Please respond with the corresponding term.
First, the total amount of air in the lungs after a maximal inspiration.
- TLC –total lung capacity.
Second, the maximum amount of air that can be expired after a maximal inspiration. In other words, the difference between maximal volume and residual volume.
- Vital capacity.
Third, the maximum amount of air that can be inspired at the end of the tidal expiration or the most air you can breathe in after a normal out breath.
- Inspiratory capacity.
And fourth, the amount of air that remains in the lungs after a normal quiet expiration.
- FRC or functional residual capacity.
What is this a memory key for?
- Breathe out in a normal way and then take a deep breath. The inspiratory capacity.
In liters, what is the normal TLC, total lung capacity?
- 6 liters.
Student doctor, please pause the tape and summarize what we’ve discussed about the four lung capacities.
- The four main lung capacities are functional residual capacity, inspiratory capacity, total lung capacity, and vital capacity. Total lung capacity is the total amount of air in the lungs after a maximal inspiration. Vital capacity is the maximum amount of air that can be expired after a maximal inspiration. In other words, the difference between maximum volume and residual volume. Inspiratory capacity is the maximum amount of air that can be inspired at the end of a tidal expiration or the most air you can breathe in after a normal out breath. FRC, or functional residual capacity is the amount of air that remains in the lungs after a normal, quiet expiration. The memory key for inspiratory capacity is ‘breathe out in a normal way and then take a deep breath.’ Normal total lung capacity is 6 liters.
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