Average lipid content of skeletal muscle is about 3% of the muscle weight, but the range Muscle Structure can be as much as 1–13% (U.S. Department of Agriculture 2008). In skeletal muscle, Skeletal muscle has a very complex organi- lipid plays roles in energy storage, membrane zation, in part to allow muscle to efficiently structure, and in various other processes in transmit force originating in the myofibrils to the organ, including immune responses and the entire muscle and ultimately, to the limb cellular recognition pathways. or structure that is moved. A relatively thick The two major types of lipid found in sheath of connective tissue, the epimysium, skeletal muscle are triglycerides and phos- encloses the entire muscle. In most muscles, pholipids
my mom's side. Not a bad look if you're a Brazilian woman. In August 2009, to con rm the obvious, I mailed DNA samples to the Gist Sports Pro le laboratory in Australia for testing of the ACTN3 gene, which codes proteins for fast-twitch muscle ber. Fast-twitch muscle bers have the greatest potential for growth, whereas slow- twitch fibers have the least potential. Just a smidge of helpful science: muscle bers are composed of myofibrils, which are in turn composed of two laments--actin (thin laments) and myosin (thick laments)--that slide over each other to cause muscles to contract, a literal shortening of the muscle. Actin laments, which are necessary to this process, are stabilized by actin-binding proteins. One actin-binding protein called alpha-actinin 3 (ACTN3) is expressed only in fast-twitch muscle ber, the crown jewel of shot-putters and bodybuilders worldwide.
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