What mechanism does nitrous oxide primarily use to induce sedation?

Nitrous oxide primarily induces sedation through the mechanism of depressing the central nervous system. This gas acts as a central nervous system depressant, which affects various neurotransmitter systems in the brain, leading to a state of sedation, analgesia, and anxiolysis. When nitrous oxide is administered, it enhances the inhibitory actions of neurotransmitters like gamma-aminobutyric acid (GABA) and inhibits excitatory neurotransmitters, creating a calming effect that allows for a reduction in anxiety and perception of pain.

The other mechanisms mentioned, such as increasing heart rate, blocking pain receptors, and stimulating respiratory activity, do not accurately describe how nitrous oxide works. While nitrous oxide can provide analgesic effects, its primary role in sedation is through CNS depression rather than direct pain receptor blockade.