Respiratory System: From Inspiration to Expiration Explained in Simple Words

The respiratory system is composed of the nose or nasal cavity, the pharynx, the larynx, the trachea, the bronchi, and the lungs. The respiratory system's functions are gaseous exchange, inhaling oxygen and exhaling out carbon dioxide, and balancing the pH of the blood. In the lungs are alveoli that are connected to the capillaries. At the alveoli gaseous exchange takes place - oxygen moves into the blood and carbon dioxide moves into the alveoli to be then expelled.