Locate movement
State what is moving, between which spaces, and the driving difference that matters.
RESPIRATORY EXCHANGE
Move gas.
Read the gradient.
Organise ventilation, diffusion, perfusion and transport before memorising a curve. Check values and clinical exceptions in an approved source.
Inspect the path
Link ventilation, barrier, perfusion and transport without treating them as isolated headings.
Protect the model
Say which assumption makes the simplified explanation useful and where it may fail.
Use time
Ask whether the question concerns steady state, exertion or an abrupt change before choosing the mechanism.
RECALL CHECK
Can you map the exchange?
Use original recall before returning to detailed diagrams and values.