So whoever Allah wants to guide - He expands his breast to [contain]
Islam. And whoever He allows to stray - He makes his breast
tight and constricted as though he were climbing into the sky. Thus
does Allah place defilement upon those who do not believe.
It can be concluded from this verse that the more one ascends
into the atmosphere the harder it is for him to breathe. This is due to the reduction
in pressure and low oxygen levels. This matter cannot be proven by anyone
unless the person ascends up into the sky! This fact was discovered only after
humans learned how to fly and reach heights.
When a person ascends into the sky beyond eight kilometers above sea level
they would encounter breathing problems due to the lack of oxygen and low air
pressure. A problem frequently encountered is hypoxia, which is a low amount of
oxygen reaching body tissues.
Another problem one may encounter is dysbarism, which is a complex of symptoms
resulting from exposure to excessively low or rapidly changing air pressure.
These two problems would interfere with normal body functions. Therefore, the
difficulty in breathing at high elevations can be explained simply as steps taken
by the body to protect itself.