Why is the lung compliance greater in expiration?

[hsk013]

Can someone please help me understand this?

Lung compliance = ability to increase and stretch the lung
Lung hysteresis = energy required to expand the lung (inspiration) is not used to contract lung
(am I understanding this right?)

Maybe I am not understanding the question is asking. I thought the question was asking, at which state the lungs are more likely to stretch...

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[Pepe18]

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[hsk013]

Wow you explained it so well! Thanks so much!

 

[Cronks1234]

I would just be careful with the calling it the Surfactant forces, its actually the surface tension forces you are fighting against. (which the surfactant is actually helping to counter to avoid collapse of the alveoli AND surfactant forces are greater when the radius is smaller just like the surface tension forces are greater when the radius is smaller helping to counter the surface tension forces proportionally!)