What are alveoli?

Answer 1

Alveoli are small air sacs in the lungs, as small as a grain of sand. There are billions of these in the lungs, and the purpose of these alveoli are to supply de-oxygenated blood with a supply of oxygen through gas exchange. They are well-equipped to do this, as well. The first reason is because the cappillaries that the alveoli are supplying with oxygen are spread all over the outside of them, meaning there is more surface area to perform gaseous exchange on. The second reason is because the alveoli walls are only one cell thick, meaning the oxygen only has two cells to go through, the alveoli wall, and the capillary wall.

Answer 2

Alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place during the process of breathing. They are surrounded by a network of capillaries where gases are exchanged with the bloodstream.

Answer 3

Alveolar means "of or relating to the alveolus", relating to the jaw ridge, the alveoli of the lungs, or, of sounds, formed with the tongue touching the inner ridge of the upper gums.

Answer 4

air sacs used during respiration (apex)

Answer 5

the small air sacs of the lungs

Answer 6

Air Sacs used during respiration [APEX]

Answer 7

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