what causes mussles to get bigger?

i know mussles get bigger when you work them out but what causes them to get biger what happens inside your body to those mussles and what causes them to ache so badly for days

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  • 1 decade ago
    Favourite answer

    What happens is you destroy your muscles. They get weaker and then your body reacts to it. Your body has to heal your muscles and they good a little bigger and stronger when they get healed

  • Anonymous
    1 decade ago

    People write dissertations on that question lol. An unbelievably simple answer would be that muscle growth is caused by hormones like testosterone, insulin, hgh, IGF1, etc... binding to androgenic receptors on the skeletal muscle and activating them. This then begins the process of protein synthesis with the recruitment of satellite cells which will ultimately result in hypertrophy. That answer is missing so many details however that you might as well worship the muscle god.

  • 1 decade ago

    Other people have said it, but....

    by putting stress on the muscles (lifting weights), eventually, the muscles rip and tear. To fix this, the muscle cells repair themselves a little bigger, and a little stronger, obviously causing the muscles to grow bigger. The aches come from the muscles ripping, and then the cells reparing.

    Source(s): My 7th grade science teacher
  • Anonymous
    1 decade ago

    when you work them out your ripping your muscles, so all those days when they are sore dats because there still ripped and are repairing themselves.

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