is it just more cells being made? how does one’s bicep for example go from like, a flabby twig, to something shapely and hard and strong? i sort of have a basic understanding about lactic acid and how that makes muscles sore after a work out but how do they get bigger?
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Skeletal muscle cells are very long, and each one contains multiple fibers composed of repeating segments of specific proteins, including actin, myosin, titin, among others. The proteins are made in the normal way (DNA to mRNA to peptide chain from amino acids to protein) and then assembled. The fibers don’t get longer, because there’s no point in making the muscle longer. Instead, more parallel fibers are placed down. Also, muscles cells have multiple nuclei and mitochondria, both of which can replicate to improve metabolism.
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