What is the respiratory (or breathing) system?
The respiratory system includes the upper and lower respiratory tract. The upper respiratory tract consists of:
- The nose and nasal cavity.
- The throat (pharynx).
- The voice box (larynx).
The lower respiratory tract consists of:
- The windpipe (trachea).
- Breathing tubes (bronchi and bronchioles).
- Air sacs (alveoli).