What are the main functions of the respiratory system as described in the chapter?

The main functions of the respiratory system are gas exchange, sound production, assistance in abdominal compression, and coughing and sneezing.

The respiratory system is responsible for several key functions. It facilitates gas exchange, which is the primary function, allowing oxygen to enter the blood and carbon dioxide to be expelled. It also plays a role in sound production through the vocal cords located in the larynx. Additionally, the respiratory system assists in abdominal compression, which is important for activities such as childbirth and defecation. Lastly, it is involved in protective reflexes like coughing and sneezing, which help clear the airways of irritants.