Aprofessional cyclist rides a bicycle that is 92 percent efficient. for every 100 joules of energy he exerts as input work on the pedals, how many joules of output work are used to move the bicycle?

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."