Where in the respiratory system can we find rings of cartilage?
Trachea
The trachea, commonly known as the windpipe is a wide, hollow tube that connects the larynx (or voice box) to the bronchi of the lungs. It is an integral part of the body's airway and has the vital function of providing air flow to and from the lungs for respiration. Any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange is called alveoli.
The diaphragm is a dome-shaped, muscular and membranous structure that separates the thoracic (chest) and abdominal cavities.