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IMG_0001_NEW_0002 - cause a change in the structure of...

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Muscle contraction reduces the length of the sarcomere and ts explatneo oy [Ite srrurrrE rrrdrrrsrrr rrrvvsr' Muscre contraction reduces the rength of the sarcomere where thick and thin firaments do not change length but slide past each other, increasing their degree of overlap' The binding of the myosin head is to myosin binding sites on the actin firament. These binding sites on actin are not exposed under low ca2'concentrations. The protein Hffiblocks the binding sites' the(troooniDcomplex (more proteins) can
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Unformatted text preview: cause a change in the structure of tropomyosin. We6 rropininiinds Ca2' which changes the structure of tropomyosin to reveal myosin binding sites' Therefore, Ca2* controls how much contraction occurs' The neuromuscular junction is where a signal is sent to the muscle' The signar moves over the muscre fiber through r-tubures so that the sarcomeres ail contract at the same time. Thesignalsentcausesareleaseofca2*f,o'th"@Thiscalciuminitiatesmuscle contraction. Uptake of Ca2'stops the contraction ' fr4:[email protected]
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