How does working out cause muscle growth?

I need to write a 2 page report on it so i need to know what working out does to cause muscles to be larger and stronger. (I would like links but you can just tell me if you are very descriptive)

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Recommanded Answer:
working out put stress on the muscle.
muscle fatigue takes place at certain moment.(muscle fibers are torn)
brain judges the situation and signals our gland to secret growth hormone to repair muscle.
secretion of hormone uses extra energy to regenerate new muscle fibers.
likewise muscle growth takes place as per the workout you make your body used too.
the body needs at least 6 months to get used to the weight of newly build muscles, so u need to workout and maintain diet for at least 6 months or body simply loses new muscles with time.