Notes on Respiratory Physiology

resp eng

In the alveoli (the functional unit where gas exchange occurs) red blood cells are in contact with capillary cells that also are next to lung endothelial cells. This structure enables the efficient exchange of carbon dioxide and oxygen from the inhaled air: the red blood cells carry carbon dioxide from tissues to the lungs where it will be removed from the body with expiration, because of its harmfulness. At the same venue the red blood cells load oxygen and carry it throughout the body to tissues where it will be consumed to get the energy needed to maintain the proper vitality of cells.

One of the most evident negative consequences of the use of traditional cigarette is precisely the increase of carbon dioxide in blood and the consequent reduction in oxygen supply to cells. Due to presence of smoke in lungs, red blood cells are compelled to collect new carbon dioxide (produced by tobacco burning) instead of oxygen.

This malfunction, causing several health problems, doesn’t exist when inhaling vapor produced by e-cig as no combustion occurs and therefore no carbon dioxide is generated. However in e-liquids there are several chemical compounds (including some flavors – even natural ones) that could produce harmful effects.



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