According to WebMD, the windpipe can stay open while still being able to bend because of its unique composition. The windpipe is made of around 20 cartilage rings with connective tissue and muscle at the back of each ring.
The windpipe is also known as the trachea. InnerBody states that it goes from the bronchi to the throat, just under the larynx. In the average person, it is about 4 inches long and around 1 inch in diameter. The inside of the trachea is lined with mucosa, which is smooth, moist tissue. The structure of the windpipe allows the individual to continue breathing effortlessly whilst bending and moving her neck.