Air space

Japanese: 気腔 - きこう
Air space

…From here onwards, the bronchi are divided into two, each branching 23 times to reach the terminal bronchiole. Beyond this are the respiratory bronchioles, the alveolar passages, and the alveoli. These areas are responsible for gas exchange and are called air spaces in contrast to the airways. The bronchi are maintained in a tubular structure by smooth muscle and, in the thicker parts, by cartilage. …

*Some of the terminology that mentions "air space" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ここから先が気管支であり,左右ともつぎつぎに二またに分かれ,それぞれ23回の枝分れをして終末細気管支に至る。これより先は,呼吸細気管支,肺胞道,肺胞であり,これらの領域は,ガス交換を営んでおり,気道に対して気腔とよばれる。気管支は,平滑筋,さらに太い部分では軟骨によって,管状の構造を維持している。…

※「気腔」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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