USMLE Step 1 Respiratory Physiology Review 60 09 Lung Capacities

USMLE Step 1 Respiratory Physiology Review 60 09 Lung Capacities

 

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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.
First, FRC

  • functional residual capacity.

Second, IC

  •  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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