The respiratory system of a sea turtle is much like that of a normal turtle with the addition of some special features that come in handy when deep sea diving. All turtles have lungs and must take in oxygen from the air. Sea turtles, however, can survive for extended amounts of time before needing to resurface. In addition they often times inflate their lungs to act as floating devices while they bask in the water. Food, water and other nutrients are ingested into two main cavities in most turtles, the mouth and the pharynx; both located inside of a turtles skull. The glottis of the turtle is a small opening positioned behind the tongue that acts as a barrier between the pharynx and the larynx when swimming underwater, diving or eating. The larynx is connected to the glottis and leads to the trachea-a tube, which splits into two separate tubes called bronchus tubes. Each bronchus then leads into a lung. The lungs which lie directly underneath of the turtle's carapace. Leatherbak turtles have the most extreme adaptations and surpass the other species in their diving ability. Leatherbacks have the ability to adjust the rate of their breathing to help them recover faster after diving and to help them become more efficient in regards to their oxygen supply. They also have the ability to store more oxygen than the other species by having more red blood cells and almost twice the typical blood oxygen carrying space.