Anything you breathe in, dust, germs particulates, all pass through the lungs, so no; the air inside would not be sterile. It'd be contaminated by anything you've taken in.
No
The areas of the body that we consider sterile are those part of the body that are not exposed to the environment. Our skin is home to vast numbers of several different types of microbes as or the openings that lead deep within. All of the organs inside our body should be considered sterile with the exception of the lumen of the G.I. tract. While the intestines are an organ inside us it houses materials that where once exposed the the environment and is home to microbes as well. Now there are times that bacteria can penetrate our organs and become infected but under normall circumstances you consider them sterile.
You should not find dangerous bacteria in any sterile environment. You should find no bacteria in that environment at all. And where is that: inside your body that has no outlet to the outside. In your blood, heart, joints, brain, nervous system, beneath your skin-all are sterile. The instruments that the surgeon uses, the bandages that are used or even band aids that are still in a sealed package. Canned food is sterile.
Sterile
Solutions such as optics are not sterile so they do not need to be compounded in a controlled environment.
Lungs
Urine is sterile until it passes out of the urethra. it then begins to accumulate bacteria from the surrounding area, so its sterile for a brief.
One is guaranteed to have no microorganisms on it inside the sterile packaging, the other is clean but is not guaranteed to have no microorganisms on it.
Yes, and I wouldn't be surprised if the cat did die from this. The lungs are a sterile environment for the most part, but the stomach can have all sorts of bacteria in it. Also, the vomit is very irritating (remember the burning sensation at the back of your nose the last time you threw up?), which causes a massive inflammatory response in the lungs that can basically flood the lungs with water and drown the cat.
If you started with none, in a sterile environment, then none.
I think Pleural (lungs), Peritoneal (abdomen), and Pericardial (heart) fluids are normally sterile. Also, synovial (joints) and cerebral spinal fluids.
Raccoons breath in oxygen just like any other mammal. They inhale oxygenated air through the mouth and nose into the lungs. The lungs absorb the oxygen and excrete carbon dioxide.