What gas, known for its analgesic properties, is frequently used in inhalational anesthesia?

Nitrous oxide is commonly used in inhalational anesthesia due to its analgesic properties. It is a colorless, non-flammable gas with a sweet taste and smell, which makes it suitable for use in medical settings. Nitrous oxide works by providing both sedation and pain relief, making it a preferred choice for minor surgical procedures and dental work. When inhaled, it interacts with the central nervous system, producing effects that can alleviate pain and induce a state of euphoria, often helping to reduce anxiety associated with medical treatments.

Other gases listed do not possess the same properties or are not typically used for anesthesia. Oxygen is essential for respiration but does not provide analgesic effects. Carbon dioxide is often used in medical applications to enhance visualization during laparoscopic procedures, but it does not serve as an analgesic or anesthetic agent. Helium, while beneficial in respiratory treatments due to its low density, lacks analgesic properties and is not utilized in inhalational anesthesia. Therefore, nitrous oxide stands out for its effectiveness and application in the field of anesthesiology.