Task: Question Answering
Input (English): Process:  -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.
 Question: What is the effect of the population increases and more human activity occurs on the muscle will shorten more.?
Output (English): none