Final answer:
Sevoflurane, Isoflurane, and Halothane are the most commonly used inhalants for gas anesthesia in horses.
Step-by-step explanation:
When it comes to gas anesthesia in horses, the most commonly used inhalants, from most commonly used to least commonly used, are Sevoflurane, Isoflurane, and Halothane. These three volatile anesthetics are widely used in veterinary medicine for their effectiveness and safety. Halothane, enflurane, and methoxyflurane are older inhalants that are not as commonly used anymore. Researchers are also exploring the use of xenon as an anesthetic. In equine anesthesia, the choice of inhalation anesthetics is influenced by the need for a smooth recovery, as horses must regain a standing position post-anesthesia. The correct order, from most commonly used to least commonly used, is C. Sevoflurane, Isoflurane, Halothane. Sevoflurane is often preferred for its quick induction and recovery properties, followed by Isoflurane. Halothane, while effective, is less commonly used due to its potential for respiratory and cardiac depression. This sequence reflects the prioritization of agents that facilitate a more favorable recovery process, ensuring the horse's ability to stand and move post-anesthesia with minimal complications.