This document provides information about the respiratory system and breathing process. It begins with defining key terms related to respiration. It then describes the main parts of the respiratory system, including the airways, nasal passages, pharynx, larynx, trachea, bronchi, bronchioles and lungs. It explains that breathing allows oxygen to enter our cells and carbon dioxide to be expelled. Finally, it outlines the two phases of breathing - inhalation where oxygen enters and exhalation where carbon dioxide leaves.