The muscle that is contracting is called the agonist and the muscle that is relaxing or lengthening is called the antagonist. Key fact One way to remember which muscle is the agonist – it's the ...

Alpha receptor agonists are substances that activate the sympathetic nervous system by stimulation of alpha receptors, similar to the effects of epinephrine and norepinephrine. Alpha receptors are ...

Recreational drugs can affect neurotransmitters in the reward pathway within the brain. They can act as either agonists or antagonists. Recreational drugs can also stimulate the release of ...

Bjorkqvist (1975) 14 R, DB, PC 4 days 60/60 Clonidine 0.15 mg up to 3 times daily vs placebo Adjunctive diphenhydramine, metaqualone, chlorproma-zine, and diphenylhydantoin allowed Self-rated and ...