Nitric oxide (NO) in exhaled air is believed to reflect allergic inflammation in the airways. Measured levels of exhaled NO vary with the exhaled flow rate, which therefore must be standardized. The ...

Vesicular breath sounds are a type of breath sound. They are often soft, low-pitched sounds. Having vesicular breath sounds is normal, but changes in those sounds can be a sign of a lung condition. As ...

The respiratory system allows air to reach the lungs, from which oxygen enters the blood and circulates to all body cells. This system also removes waste gases from the body and helps prevent disease ...