Contrary to what might be expected from environmental concerns related to global warming, CO2 (carbon dioxide) health effects and benefits for the human body are innumerable. Life originated and had existed on Earth for millennia under conditions of very high CO2 content of the surrounding air. According to published studies, CO2 content was up to about 7-12% in air when the first creatures with lungs were evolving. Therefore, these creatures could experience all CO2 health benefits that are listed below.
Note that very large CO2 concentrations (20% and more) produce adverse effects in humans and pure CO2 is a toxic gas. This web page is focused on typical or physiological CO2 levels in the lungs which range from about 20 to 50 mm Hg or from about 2.7 to 7.5%.
Having a normal level of CO2 in the lungs and arterial blood (40 mm Hg or about 5.3% at sea level) is imperative for normal health. Do modern people have normal CO2 levels? ? When reading the table below note that levels of CO2 in the lungs are inversely proportional to minute ventilation rates, in other words, the more air one breaths the lower the level of alveolar CO2.
Hypocapnia (CO2 deficiency) in the lungs and, in most cases, arterial blood is a normal finding for chronic diseases due to prevalence of chronic hyperventilation among the sick.
Furthermore, as we discovered before, over 90% of modern people (so called "normal subjects") are also hyperventilators (see the link below to the Hyperventilation Table with over 20 medical research studies related to normal subjects). Hence, chronic hypocapnia is very common for modern man.
Main CO2 health effects and uses in the human body
Follow the links for dozens of research references
-
Vasodilation (expansion of arteries and arterioles). As physiological studies found, hypocapnia (low CO2 concentration in the arterial blood) constricts blood vessels and leads to decreased perfusion of all vital organs
http://www.normalbreathing.com/CO2.php
.