I often go through windows instead. Even though glass is just as solid as brick, psychologically there's much less resistance passing through it as you can already see beyond it. When there's a windowless wall, thinking visually about what's on the other side helps, as does easing into it backwards.
A couple of times, I've had individual wall sections turn invisible automatically, before I've even had a chance to consciously think of them as obstructions. I don't know the trick for this yet, but very smooth, refined vibrations seem to be a factor.
During respiration the exchange of gases takes place through the walls of the alveoli. From there, the oxygen is taken by the blood to the body tissues.
No, you are not tangible while having an out-of-body-experience. It is actually your spirit, or astral body leaving your physical body. You can go through doors, walls, and things you would normally not be able to get through without manipulating it. You are in fact your own ghost!
Inhaled oxygen will diffuse through the walls of the lungs. It will also diffuse through the walls of red blood cells so it can be carried all over the body.
They use diffusion to get air through there body walls.
Capillaries
Capillaries
Water passes through the walls of the colon into the blood. This process helps maintain the body's fluid balance and prevent dehydration.
artria
radio and tv beams can pass through concrete as x-rays pass through the body
They breathe through their body walls. Leeches absorb oxygen through their skin rather than breathing through a nose.
I have asked the same question. I wondering if you tricked your body into thinking you are pregnant then will you go through the pain. I am surely having pain.
Building fortifications, foxholes, walls natural terrain and there was body armor available.