Respiratory System

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Last updated 5:32 PM on 4/20/26
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24 Terms

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<p>External nares</p>

External nares

  • openings of the nose (nostrils)

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<p>Internal nares</p>

Internal nares

  • openings that connect the nasal cavity to the pharynx

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<p>Pharynx</p>

Pharynx

  • throat (passageway for both air and food)

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<p>Nasopharynx</p>

Nasopharynx

  • behind the nose; air only

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<p>Oropharynx</p>

Oropharynx

  • behind the mouth; air + food

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<p>Laryngopharynx</p>

Laryngopharynx

  • leads to larynx (air) and esophagus (food)

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<p>Epiglottis</p>

Epiglottis

  • blocks airway when swallowing

When food/liquid enters the trachea instead of the esophagus, it triggers coughing

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<p>Larynx</p>

Larynx

  • produces sound and keeps airway open

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<p>Thyroid Cartilage</p>

Thyroid Cartilage

  • protective cartilage (Adam’s apple) around the larynx

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<p>Trachea</p>

Trachea

  • windpipe; conducts air to lungs

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<p>Bronchi</p>

Bronchi

  • two main branches into each lung

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<p>Bronchioles</p>

Bronchioles

  • smaller branching airways

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<p>Alveoli</p>

Alveoli

  • tiny air sacs where gas exchange occurs

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Conducting zone

  • moves air (no gas exchange)

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Respiratory zone

  • where gas exchange occurs (alveoli)

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Diffusion

  • Gas exchange happens passively due to a difference in concentration

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