Anatomical Dead Space

[Alde8127]

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How does anatomical dead space vary?
I thought that it is a fixed volume in a person. Is it due to the size of the subject - i.e. larger means greater anatomical dead space?

And is the reason physiological dead space can't be measured directly because you need to know both anatomical and alveolar dead spaces before?

Thanks

 

[Alde8127]

Anyone?