The respiratory system is made up of several organs and structures, including the lungs, windpipe, diaphragm and alveoli. It is responsible for taking in oxygen and expelling carbon-dioxide waste.

Until recently, COVID-19 seemed to be a harmless pathogen of minor outbreaks of unremarkable and mild acute respiratory (or intestinal) diseases. At the same time, many similar microorganisms lived in ...

The remarkable organs that bring oxygen to every cell in your body deserve special attention. Your lungs process approximately 11,000 liters of air daily, filtering contaminants and delivering ...