Buprenorphine is classified

Buprenorphine is classified as:
a) Partial agonist at mu receptor
b) Partial agonist at kappa receptor
c) Full agonist at mu receptor
d) Full agonist at kappa receptor

All of the following are actions of muscarinic antagonists, except:
a) Decrease gastric secretions
b) Decrease respiratory secretions
c) Contract radial muscles of iris
d) Facilitate AV conduction