This 1930s educational film provides a detailed exploration of the respiratory and excretory systems, combining live-action demonstrations, animations, and intertitles to illustrate human anatomy ...

People have an average of 480 million alveoli in their lungs, located at the end of bronchial tubes. When you breathe in, the alveoli expand to take in oxygen. When you breathe out, the alveoli ...

When the bronchi in your lungs are exposed to a virus, they swell and fill with a thick fluid called mucus. This excess fluid constricts the airflow, making it difficult to breathe.

The trachea is a tube-like structure in the neck and upper chest. It stretches from the larynx, or voice box, to the bronchi and transports air to and from the lungs when a person breathes. When a ...

The bronchi divides into many tubes called bronchioles. The bronchioles divide until they end up in tiny air sacs called alveoli. There are millions of alveoli found within the lungs.

A study conducted by Brazilian researchers has shown for the first time that a similar phenomenon occurs in the lungs. High blood pressure hardens the bronchi and increases airway resistance ...

Causes can include having a lung infection such as pneumonia or whooping cough, cystic fibrosis, underlying problems with the body's immune system that make the bronchi more vulnerable to ...