when increased constant tension is applied to embryonic skeletal muscle fibers differentiated in a tissue culture environment , many of the same biochemical processes associated with muscle hypertrophy in vivo are also stimulated in vitro , e.g. , sodium-dependent amino acid transport , na+ , k+-atpase ( sodium pump ) activity , protein synthesis , total protein , and myosin heavy chain accumulation .
C0001473
atpase
C0001479
sodium pump