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The respiratory system is essential for delivering oxygen to the body's cells and removing carbon dioxide. In hum, air ent through t nose o mouth. Inco air ge warmed u and bec moist wh it tra in the nasal passages. Dust and other particles are also filtered out. Then the air goes down the trachea and reaches the lungs. Within the lungs, tiny air sacs shaped like balloons facilitate the exchange of gases with the bloodstream. This process is crucial for cellular respiration, which provides energy for bodily functions.
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参考答案：ans ers he r ming ts p omes ile vels