Did lifting weights builds up our myofibrils or increases the volume of sarcolemma?

Dear student,
Refer below for above asked query:-
Weight lifters increases muscle fiber size by increasing the myofibrils.
These Weight lifters undergo repetitive exercises which stimulate the production of myofibrils , mitochondria and other organelles.
These newly produced myofibrils enlarges the existing muscle.

Hope this information will clear your doubts about topic.

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