Читать книгу Understanding Anatomy and Physiology in Nursing - John Knight - Страница 155

The airway below the vocal cords marks the beginning of the lower respiratory tract; the trachea progressively subdivides into smaller and smaller airways (Figure 4.4). The tracheobronchial tree usually consists of 23 subdivisions (generations) of the airway before the conditioned air reaches the alveolar air sacs.