. Respiratory centre depression is caused by all except-
Opium
Strychnine
Barbiturates
Gelsemium
Strychnine is a toxic alkaloid that acts as an antagonist of the inhibitory glycine receptor of CNS,thereby producing overstimulation of nervous system. Barbiturates,opioids and gelsemium(yellow jasmine) are potential respiratory centre depressants.
Respiratory system