Unformatted text preview: of tropomyosln' ifiF&g 1L +',a crr 'n to revealmyosin binding sites' Troponin binds Ca- which changes the structure of tropomyost Therefore, Caz* controls how much contraction occurs' The neuromuscurar junction is where a signal is sent to the muscle' The signar moves over the muscre fiber through r-tubures so that the sarcomeres at contract at the same time' The signar sent causes a rerease of caz* from the sarcopri'qn]lg rellEjggL This carcium initiates muscle contraction. Uptake of Ca2* stops the contraction' M/f9$ 3. There are basicallgthree types of muscle 1) Skeletal muscle: bundles of long fibers running the length of the muscle; appears striated because the actin and mysin filaments are regularly .rr.y"d in a cell; skeletal muscles contract when stimulated bY motor neurons ir-na .!/ l...
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- Fall '10
- binding sites, Muscre contraction