The Upper Respiratory Tract Holes and Tubes Above the Tree

The extensively branching network of the respiratory tree doesn't begin immediately. Rather, the first thing we encounter within the respiratory system is the Upper Respiratory Tract (see Figure 13.1). The Upper Respiratory Tract can be defined as the superior portion of the respiratory system, which is literally involved in ''breathing'' (spir) ''again and again'' (re-). Speaking informally, the Upper Respiratory Tract consists of the holes and tubes above the branching portion of the respiratory sytem - the respiratory tree.

Fig. 13.1 The upper respiratory tract: Our airway down through the trachea (sagittal view).

To capsulize:

UPPER RESPIRATORY TRACT - Mostly Unbranched Holes and Tubes

The first places where we usually ''breathe again and again'' are through the nasal (NAY-sal) cavity and the oral (OR-al) cavity. The nasal cavity is the large hollow space within the ''nose'' (nas), while the oral cavity is situated just behind the lips and teeth of the ''mouth'' (or).

Oral cav

Oral cav

Fig. 13.1 The upper respiratory tract: Our airway down through the trachea (sagittal view).

Esophagus (part of the digestive tube)

Lying above the Respiratory Tree, and Involved in Breathing

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