In this task, you are given a paragraph, and your job is to generate comma-separated entities present in the given paragraph. Generate entities from a given passage in such a way that (i) they are present in the paragraph, (ii) they are non-duplicate, (iii) they underwent a state change during the process. Avoid creating entities that (i) aren't present in the process paragraph and (ii) aren't significant. 

Q: Electrical signals in the brain travel through nerves to muscles. Two types of proteins exist in filaments in the muscles. The filaments move when the brain instructs them to. The motion of the filaments cause the muscle to shorten and contract. Opposing pairs of muscles exist in order to provide the necessary range of motion. 

A: electrical signals ,proteins ,filaments 
****
Q: You speak into the receiver on your phone. Sound waves move parts inside the receiver. Movement causes the magnet inside to produce eletricity. Electricity is transferred through  a wire or cable. A membrane in the other persons phone is vibrated by the magnet in their telephone. Sound is produced. They hear you. 

A: Speak ,Sound Waves ,Electricity ,Sound 
****
Q: A reservoir is formed. The collects water converting the water's from kinectic to potential. The water is forced through a turbine under the reservoir. The turbine spins and so does the generator connected to it. The water's energy is turned into electrical energy. The transformer converts electrical energy from the generator to a high voltage. The national grid uses high voltages to transmit electricity through the power lines. 

A:
reservoir ,water ,turbine ,generator ,water's energy ,electrical energy ,high voltage ; electricity 
****