Increasing your muscle size is known as hypertrophy. This basically means the increase in skeletal muscle through the increase in the size of its component cells. There are two factors that help your muscles to grow; sarcoplasmic hypertrophy is all about the glycogen storage within muscles and myofibrillar hypertrophy which is concerned with increased myofibril size.
Mindlessly staring at a question for minutes on end doesn't make the answer magically appear. All it achieves (if achieves isn't too strong a word in this context) is to make the question seem even more incomprehensible than it did in the first place. And it seemed pretty incomprehensible initially.