Our atmosphere may be the richest in oxygen after nitrogen gas. It constitutes about 21% in the total gases. Oxygen is one in the essential elements for the survival along with water and minerals. We have been given an intricate and well-built mechanism for breathing, such as lungs, diaphragm, bronchioles, and wind pipe. However, it could frequently get disturbed because of the improper functioning of lungs. In such a situation, medical ventilators serve the function of lungs. a cosa è dovuta l eiaculazione precoce
