Respiratory system - image description

The illustration shows the position of the upper airways in the head and neck, and the lungs in the chest. It shows the nose and mouth which both join to the windpipe (trachea). The windpipe extends down the neck area and divides into two tubes called the right and left bronchus. The left bronchus goes into the left lung, and the right bronchus into the right lung. These divide into smaller tubes called bronchioles. At the end of the bronchioles are air sacs called alveoli. The pleura is the lining that surrounds both lungs. Underneath the lungs is a layer of muscle called the diaphragm which stretches across the whole width of the body. Surrounding the lungs are the ribs and the muscles between them.