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The more we rise up from the surface of the earth, the more the air
pressure decreases, thus leading to decrease of the rate of air passage
through alveoli pulmonis to blood. Decrease of air pressure also leads to
distention of gases in stomach and intestines that push the diaphragm
upwards, thus pressing over and obstructing the extension of lungs.
Stages of the symptoms of oxygen shortage phenomena:
These are divided into four stages that relate to air pressure and the level of
altitude and the rate of oxygen concentration in blood.
1- The stage of non alteration, i.e., from the level of sea to an altitude of 3 km.
In this stage, the symptoms of oxygen shortage are not present and sight is not
affected at day time.
2- The stage of physiological adjustment, i.e., from an altitude of 3 km to 5
km. Body systems function in this stage in such a way that will not let the
symptoms of oxygen shortage appear, unless the period of exposing to such a
shortage is elongated, or the person exerts physical effort in such conditions. In
that case, rates of respiration, pulse, blood pressure and circulation increase in
number and depth.
3- The stage of physiological disturbance, i.e., from an altitude of 5 km to 8
km. In this stage, body systems, particularly the lungs, cannot afford to function
properly or supply the quantity of oxygen needed by tissue sufficiently. Hence
the symptoms of oxygen shortage appear. In this stage, a clear explanation is
established for man’s feeling of exhaustion, headache, feeling like to sleep,
dyspnea and chest tightness when rising up in high altitudes. As a result of air
pressure decrease, all air comes out of lungs and alveoli pulmonis, reducing the
size of lungs and chest (i.e., the chest becomes really tight).
4- The stage of chest tightness, i.e., from an altitude of 8 km upwards. In this
stage, man loses consciousness totally due to the failure of the nervous
system, and condition becomes critical.
The higher the man climbs up in sky the less is the oxygen
The Quran which was revealed fourteen centuries ago to Prophet Mohammed
(PBUH) states: “Whomsoever Allah desires to guide, He expands his chest to