Skeletal muscle cells can take up glucose with or without insulin via GLUT4 transporters and convert it to lactate or ATP, and can also utilize fatty acids.

“pick a myocyte in your leg right it it can take glucose out of circulation it can either with or without insulin bring that glucose molecule through a glut4 transmitter directly into the cytoplasm it can depending on the speed at which it requires atp it can very rapidly take that to pyruvate and ultimately to lactate or it can more slowly take the pyruvate into the mitochondria and generate more atp there it can do the same thing with fatty acids of course with fatty acids”