When your arm bends, what muscle is the flexor?

Darren was recently ticketed for speeding over 110 mph on the freeway. when the police officer stopped darren and asked him why he was going so fast, he replied that he was "king of the world." the month before this, darren felt sad and listless and had trouble getting up the energy to go to school. he probably suffers from:

Which type of nerve creates a 'mental map" of the relative positioning of the body at any given point in time?

Which is the lipid molecule that controls what types of molecules can pass though?