The lower respiratory tract consists of:
- Larynx and trachea
- Bronchi
- Bronchioles
- Alveoli (lungs)
Therefore, the respiratory tract from the larynx down is called the lower respiratory tract while the respiratory tract above the larynx is called the upper respiratory tract. Disorders of the lower respiratory tract usually present with one or more signs of breathing difficulty.
Lower respiratory tract disorders usually present with one or more signs of breathing difficulty.