The respiratory system is the body system responsible for the exchange of gases between body fluid and the outer environment. It includes the upper respiratory tract (nostrils, nasal cavity, pharynx) and the lower respiratory tract (larynx, trachea, bronchi, lungs).
Definition
Respiratory System: The body system which is responsible for the exchange of gases between body fluid and the outer environment is called the respiratory system. The human respiratory system can be divided into two regions: the upper respiratory tract and the lower respiratory tract.
Upper Respiratory Tract: Includes the nostrils, nasal cavity, and pharynx.
Lower Respiratory Tract: Includes the larynx, trachea, bronchi, and lungs.
Main Idea
Brings oxygen into the body
Removes carbon dioxide from the body
Filters, warms, and moistens the air
Provides a surface for gas exchange
Works with the circulatory system to transport gases
