What is the function of respiratory system ?

The main function of the respiratory system is to facilitate the exchange of oxygen and carbon dioxide between the body and the environment. This process is essential for the body to obtain oxygen for cellular respiration, which is necessary for producing energy, and to remove carbon dioxide, a waste product of cellular metabolism. The respiratory system also helps regulate the body's pH balance, filters out harmful substances from the air we breathe, and plays a role in vocalization and sense of smell.