Musclular System

Musclular System - detach, pulling the actin filaments...

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Angelo Crespin 10/30.09 Biology 237.001 Stimulus-Contracting Coupling 1) An impulse arrives at the axon terminus generating an action potential which is propagated along the sarcolemma and down the T tubules 2) Next, the action potential triggers Ca 2+ release from terminal cisternae of SR 3) Then, Calcium ions bind to troponin. This causes the troponin to change shape, removing the blocking action of tropomyosin. Actin active sites then become exposed 4) Contraction occurs next and myosin cross bridges alternately attach to actin and
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Unformatted text preview: detach, pulling the actin filaments toward the center of the sarcomere. Then, the release of energy by ATP hydrolysis powers the cycling process. 5) Ca 2+ is then removed by active transport into the SR after the action potential ends 6) Finally, tropomyosin blockage restored blocking actin active sites causing contraction to end and muscle fibers to relax....
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This note was uploaded on 11/02/2009 for the course BIOLOGY A&P taught by Professor Swan during the Spring '09 term at Minnesota.

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