Alveoli in the lungs, fish gills and the villi in the small intestine are adapted so that they have short diffusion distance, big concentration difference and large surface area. This means that ...

At the end of the alveoli are capillaries, which are tiny blood vessels. Oxygen moves from the lungs to the bloodstream through these capillaries. In exchange, carbon dioxide moves from the blood ...

a: Gross anatomy of lung and thorax. b: Microscopic anatomy of bronchial wall. C: View of terminal airway and alveoli. d: Alveolar structure.

These three features are particularly important to our lungs for efficient ... such as the small intestine, body tissues and placenta. Thin lining: the lining of the alveoli is very thin so ...

Now, in a recent Science Immunology study, Marichal and his colleagues confirmed that these unusual cells that emerged following an IAV infection are macrophages, and that they facilitate the repair ...

Cardinal David asks for prayers for Pope Francis who has been admitted to a hospital in Rome and developed pneumonia.

“The lungs are an intricate organ with more than 23 airways branching from the trachea to the alveoli,” he says ... or hernias in which the small intestine and fat tissue protrude into ...