deadspace

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...

Hey guys, Can someone help me understand deadspace conceptually. I understand the concept of anatomic and physiologic deadspace - that is that the airways without alveoli constitute anatomical deadspace and that damaged alveoli or underperfused alveoli represent physiologic deadspace. What I...