What bodily activities is the respiratory system involved in besides oxygen for the body?

Besides facilitating oxygen exchange, the respiratory system plays a crucial role in regulating the body's pH balance through the control of carbon dioxide levels. It also aids in vocalization by allowing airflow over the vocal cords, enabling speech and sound production. Additionally, the respiratory system helps filter and humidify incoming air, protecting the lungs from pathogens and irritants. Furthermore, it assists in olfaction, or the sense of smell, by allowing odor molecules to reach the olfactory receptors in the nasal cavity.