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10. Human Physiology pt 2 12.jpg - MUSCLE CONTRACTIONS...

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Adenosine triphosphate

Unformatted text preview: MUSCLE CONTRACTIONS muscle cell consists -i " nyofibril bundles consists - sarcomeres smalless funeting contractile unit structure : multinucuated function : transcription a translation for actin + hyoown production for muscle hypertroph I Gard / light wal- A - bond / Dark band . - I band / light hand - show .3 . ACTIN SARCOMERE At most heads must be long enough to possibly attach to action PROCESS of MUSCLE CONTRACTION ACTION POTENTIAL ( see x-2 pages ) @ neuromuscular junction CALCIUM RELEASED will action potential arrives at t-tables causes voltage gated calcium channels to open on carco plasmice reticulum relearn calcium 2 calcium cong troponin on tropomyosin , cously frogonosm to fall off i expose myosin buding sites on actin surface MUSCLE CONTRACTION ATP binds to myoaks head, cansly marolysis into ADP + Pi. this causes the most head to attach to exposed badly sites formly a cross bridge. At the game the myoak pulls actin filaments within a sarcomere closer together, called DOWe stroke . 2 ADP + Pi then released 3. ATP molecule buds to myool head to reset it to original portion...
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