Most breathing conversations never go this deep.
In this episode, we unpack one of the most misunderstood areas in respiratory physiology:
Ventilation. Perfusion. Respiration.
And how they integrate through ventilation–perfusion (V/Q) matching.
We break down:
• Ventilation — the mechanical movement of air driven by pressure–volume relationships
• Perfusion — blood flow through the pulmonary capillaries
• Respiration — the transfer of oxygen and carbon dioxide across the alveolar membrane
From there, we explore V/Q coupling and why the resting ratio sits around ~0.8 — the dynamic balance between airflow and blood flow inside the lungs.
Then we move deeper.
Into alveolar stability.
Into surfactant.
Into why small lung units collapse throughout the day due to posture, compression, or shallow breathing.
And why reopening them requires increased inflation pressure.
This is where sighing becomes physiologically important.
A sigh isn’t a trendy technique.
It’s a breath two to three times larger than normal tidal volume.
That larger inflation:
• Increases pressure
• Redistributes ventilation into smaller airways
• Re-expands collapsed alveoli
• Allows surfactant to stabilise them again
This is how mechanics, gas exchange, and functional breathing behaviour connect.
This clip is taken from inside a private 1:1 mentorship session — where we don’t just learn techniques, we reason through physiology.
If you’re a practitioner who wants a higher level of clarity, deeper thinking, and structured physiological integration into your work…
I’ve opened a small number of 1:1 mentoring spots.
You can check eligibility and book a call via the link below
https://www.schoolofbreathscience.com/get-certified/
00:00 Ventilation vs Respiration vs Perfusion
00:26 Ventilation–Perfusion (V/Q) Coupling
00:56 Why the Resting V/Q Ratio is ~0.8
01:07 Surfactant & Alveolar Stability
02:11 Why Alveoli Collapse Throughout the Day
02:30 What Defines a Physiological Sigh?
03:12 Back-Pressure & Reopening Collapsed Alveoli
03:34 Integration & Wrap-Up
