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在呼吸時,空氣會通過鼻腔,往下進入氣管,然後進入愈來愈小的呼吸道,稱為支氣管。支氣管分岔形成更小的呼吸道,稱為細支氣管,最後進入像一串葡萄般微小薄弱的氣囊,稱為肺泡。 在吸氣時,肺臟中的肺泡會充滿空氣,氧氣和二氧化碳就在肺泡進行交換。血液細胞從肺泡的微血管吸收氧氣,而二氧化碳則從靜脈釋回肺臟。在呼氣時,二氧化碳就隨之排出體外。然後將含氧血送到心臟,再泵注回全身各處需要氧氣的地方。
Duration: 00:53
Published: 2016/2/25
Blausen Medical
Scientific and Medical Animations
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