The Respiratory System: Oxygen In, Carbon Dioxide Out
Classified in Biology
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1) Respiratory Tract:
Passages through which oxygen enters the lungs and carbon dioxide is expelled.
- Nasal Passages: Air enters the nose and continues through these passages, where it is moistened and warmed. Dust and microorganisms in the air are retained here.
- Pharynx: Air from the nasal passages reaches the pharynx, which is part of both systems.
- Larynx: Made of cartilage. The vocal cords vibrate and enable humans to make sounds.
- Trachea: C-shaped cartilage rings through which air travels from the larynx to the bronchi.
- Bronchi and Bronchioles: Bronchi are two tubes that branch out from the trachea into each lung. They divide into small tubes called bronchioles, rounded sacs