all the blood goes to the feet and you need blood in your face, so when you lie down the blood comes to your face
Air in the chest (Thorax) causes the lung to collapse. This can be spontaneous or after chest injuries
Running
When you stand for a long time, it may cause your knees to buckle resulting in a vaso-vagal reaction. When this happens, there is a decrease in blood pressure which can make a person collapse or faint.
If they are cold
Hyper-resonance (generally described upon percussion of the chest) is typically seen in Pneumothorax, where an accumulation of air in the pleural space causes compression / collapse of the lung on the affected side. Note that hyper-resonance is a late sign, and is seen infrequently.
A civilization can collapse for many causes such as drought, disease or being conquered.
Gravity.
Gravity.
Gravity.
fatigue
Colony collapse is when bees mysteriously disappear. Vampire mites and nicotine-based insecticides are among the possible causes.
Causes of collapse for which rescue breathing may be needed are anaphylactic shock, heart attack, and poisoning.
pickles
Big Government
Same as any cave collapse: erosion weakening the surrounding rock.
the cause of structures to collapse during earthquakes are upheavals of tectonic plates..
The collapse of a star is based on its age. When it runs out of "Fuel" its inside contracts as the outside expands. it can then super nova or collapse into a tiny star.