the lungs are the working structures of the respiratory system and they have several functions. what are the functions of the lungs? select all that apply
a. Oxygenation: The lungs facilitate the exchange of oxygen and carbon dioxide during the process of respiration.

b. Removal of Carbon Dioxide: The lungs help eliminate carbon dioxide, a waste product produced by cells during metabolism.

c. Acid-Base Balance: By regulating carbon dioxide levels, the lungs contribute to maintaining the body's acid-base balance.

d. Filter and Humidify Air: The respiratory system, including the lungs, filters and humidifies the air, preparing it for optimal gas exchange in the alveoli.