👉 Pulmonarian is a medical term that refers to the process of breathing in air. It involves the opening and closing of the lungs, which are located at the back of the chest. The lungs are divided into two main parts called bronchi (or bronchioles) and alveoli (or alveolae). When you inhale, your diaphragm (the muscle that raises your chest when you breathe) causes the air sacs (bronchi) to expand, which