"Our natural matrix generated the same pattern, with tracheal cells only in the trachea, alveoli-like cells in the alveoli, pneumocytes only in the distal lung, and definite transition zones ...

Human lungs are spongy vessels made up of millions of microscopic, balloon-shaped air sacs called alveoli, the workhorse of the respiratory system where the exchange of gases takes place.

The gas exchange system affects oxygen, nitrogen and carbon dioxide from the air. Find out more with BBC Bitesize in this article for 11-14 year old students.

Treating collapsing trachea in dogs can be a daunting prospect for owners. Tracheal collapse occurs when the windpipe becomes flattened and the airflow in and out of the lungs is obstructed.

What They Do. YOU KNOW FROM high school that your lungs bring in oxygen and move it to the blood (inhale) while taking carbon dioxide out of the blood (exhale). Not as well-known: ...

Localized lung habitats differ since the respiratory system includes different environments, such as the oral and nasal cavities, larynx, pharynx, bronchi, trachea, alveoli, and bronchioles.

The first child in history to receive a trachea fashioned by his own stem cells has shown remarkable progress since the initial transplant two years ago, marking a new record for the novel procedure.

A New York woman is looking forward to the future with her family after receiving the first trachea transplant ...

When human viruses were tested, both attached strongly to the trachea and bronchi, but virus binding to the bronchioles and alveoli (deeper within the lung) was less abundant in comparison.

Alveoli Alveoli are tiny air sacs in the lungs where gas is exchanged during breathing. Within the human lungs the alveoli provide an efficient exchange surface adapted for gas exchange.

"Our natural matrix generated the same pattern, with tracheal cells only in the trachea, alveoli-like cells in the alveoli, pneumocytes only in the distal lung, and definite transition zones ...