Anatomy

• Vertebrate trachea
  Vertebrate trachea
  In tetrapod anatomy the trachea, or windpipe, is a tube that connects the pharynx or larynx to the lungs, allowing the passage of air. It is lined with pseudostratified ciliated columnar epithelium cells with goblet cells that produce mucus...
  
  , also known as the "windpipe", a tube present in tetrapods that connects the pharynx or larynx to the lungs, allowing the passage of breathing gas (most commonly air)
• Invertebrate trachea
  Invertebrate trachea
  The invertebrate trachea refers to the open respiratory system composed of spiracles, tracheae, and tracheoles that terrestrial arthropods have to transport metabolic gases to and from tissues....
  
  , the open respiratory system employed by most terrestrial arthropods to transport metabolic gases to and from tissues
• Siphon (mollusc), a tube-like structure through which water or air may flow for one or more purposes such as locomotion, feeding, respiration, and reproduction
• Siphon (insect), a tubular organ of the respiratory system of some insects that spend a significant amount of their time underwater, that serves as a breathing tube

Medical applications

• Laryngeal mask airway
  Laryngeal mask airway
  The laryngeal mask airway is a supraglottic airway device invented by Archie Brain, a British anaesthetist.-Description:Laryngeal masks consist of a tube with an inflatable cuff that is inserted into the pharynx. Laryngeal mask airways come in a variety of sizes ranging from large adult to infant...
  
  , a supraglottic airway device used in anesthesia and in emergency medicine for airway management
• Tracheal tube
  Tracheal tube
  A tracheal tube is a catheter that is inserted into the trachea in order for the primary purpose of establishing and maintaining a patent airway and to ensure the adequate exchange of oxygen and carbon dioxide. Many different types of tracheal tubes are available, suited for different specific...
  
  , a device that is inserted into the trachea to establish and maintain an airway
• Anesthetic machine
  Anaesthetic machine
  The anaesthetic machine is used by anaesthesiologists and nurse anaesthetists to support the administration of anaesthesia...
  
  , a machine which may be connected to a mask, laryngeal mask airway or tracheal tube to support the administration of anaesthesia
• Medical ventilator
  Medical ventilator
  A medical ventilator can be defined as any machine designed to mechanically move breatheable air into and out of the lungs, to provide the mechanism of breathing for a patient who is physically unable to breathe, or breathing insufficiently....
  
  , a machine which may be connected to a mask, laryngeal mask airway or tracheal tube to mechanically move breatheable air into and out of the lungs
• Bag valve mask
  Bag valve mask
  A bag valve mask is a hand-held device used to provide positive pressure ventilation to a patient who is not breathing or who is breathing inadequately. The device is a normal part of a resuscitation kit for trained professionals, such as ambulance crew...
  
  , a device which may be connected to a mask, laryngeal mask airway or tracheal tube to mechanically move breatheable air into and out of the lungs
• Anesthesia breathing circuit, a system of breathing hoses which may be connected to a mask, laryngeal mask airway or tracheal tube to support the administration of anaesthesia

Underwater applications

• Snorkel, a J-shaped rubber or plastic tube fitted with a mouthpiece at the lower end, used for breathing air from above the water surface when the wearer's mouth and nose are submerged
• Breathing tube (breathing apparatus), a flexible tube in a scuba set or other breathing set
• Surface-supplied diving, a device used to connect a surface-supplied diver to a supply of breathing gas remotely maintained on a diving support vessel or diving chamber, referred to as a "Umbilical cord"
• Snuba
  Snuba
  Snuba is an underwater breathing system developed by Snuba International.The word Snuba is a portmanteau of "snorkel" and "scuba". The swimmer uses swimfins, a diving mask, weights, and diving regulator as in scuba diving....
  
  , an underwater breathing system in which breathing gas is supplied through a long hose from tanks on pontoon rafts on the surface of the water

Aviation and space applications

• Primary Life Support System
  Primary Life Support System
  A Primary Life Support System , is a device connected to an astronaut's or cosmonaut's spacesuit, which allows extra-vehicular activity with maximum freedom, independent of a spacecraft's life support system. The PLSS is generally worn like a backpack...
  
   (PLSS), a machine that provides breathing gas, removes exhaled carbon dioxide and water, regulates atmospheric pressure, and monitors certain physiologic parameters within a space suit

Military and industrial applications

• Self-contained breathing apparatus (SCBA), a device worn by rescue workers, firefighters, and others to provide breathable air in an IDLH (Immediate Danger to Life and Health) atmosphere
• Gas mask
  Gas mask
  A gas mask is a mask put on over the face to protect the wearer from inhaling airborne pollutants and toxic gases. The mask forms a sealed cover over the nose and mouth, but may also cover the eyes and other vulnerable soft tissues of the face. Some gas masks are also respirators, though the word...
  
  , a device designed to be applied over the face to protect the wearer from inhaling airborne pollutants and toxic gases
• Respirator
  Respirator
  A respirator is a device designed to protect the wearer from inhaling harmful dusts, fumes, vapors, or gases. Respirators come in a wide range of types and sizes used by the military, private industry, and the public...
  
  , a device designed to protect the wearer from inhaling harmful dusts, fumes, vapors, and/or gases