Breathing is an essential function of the human body, and the cycle of inhalation and exhalation is crucial to maintaining our health. Here is a summary of the breathing cycle: During inhalation, the air is drawn into the lungs through the nose or mouth. The air then enters the trachea, which branches off into the bronchi and led to smaller sacs called alveoli. The alveoli are lined with tiny blood vessels called capillaries, through which oxygen from the air diffuses into the bloodstream. Meanwhile, carbon dioxide diffuses out of the bloodstream and into the alveoli, where it is exhaled back out of the body.
The entire process happens in a matter of seconds, and it is essential for keeping the body supplied with oxygen and removing carbon dioxide. Respiratory diseases can interfere with normal breathing. These include respiratory infections such as pneumonia, and other diseases like asthma, and COPD.