Which part of the respiratory system is also digestive system?

The part of the respiratory system that is also part of the digestive system is the pharynx. The pharynx is a muscular tube that connects the nasal cavity and the oral cavity to the larynx and the esophagus. It is involved in both breathing and swallowing. During breathing, air passes through the pharynx on its way to the lungs. During swallowing, food passes through the pharynx on its way to the esophagus.