肺的工作原理
How the Lungs Work
详细解释呼吸系统的工作原理：空气经鼻腔或口腔进入，通过气管，进入支气管和细支气管，最后到达肺部的微小小气囊（肺泡），在这里氧气进入血液，二氧化碳排出。
Explain how the respiratory system works in detail: air travels through the nose/mouth, down the trachea, into bronchi and bronchioles, reaching tiny air sacs (alveoli) in the lungs where oxygen passes into the blood and carbon dioxide passes out
学习证据 / Evidence
- 描述空气路径：鼻/口 → 气管 → 支气管 → 细支气管 → 肺泡
- 解释肺泡中的气体交换：氧气进入血液毛细血管，二氧化碳排出
- 描述呼吸的机械过程：膈肌收缩吸入空气，放松呼出空气
- Trace the air pathway: nose/mouth → trachea → bronchi → bronchioles → alveoli
- Explain gas exchange in the alveoli: oxygen passes into blood capillaries, carbon dioxide passes out
- Describe the mechanical process: the diaphragm contracts to pull air in and relaxes to push air out
评估问题 / Assessment
{{name}}能描述吸进去的空气会发生什么吗——空气如何越来越深入地进入肺部，直到氧气进入血液？
Can {{name}} describe what happens to the air they breathe in — how it travels deeper and deeper into the lungs until oxygen swaps into the blood?