110309cap - 11/3/09 -whats the length of no longer tension?...

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11/3/09 -what’s the length of no longer tension? In vertebrates -no longer overlap of actin/myosin -myosin+2 actins -what’s the length of no tension in sarcomeres? -same: myosin + 2 actin -why is there a straight line between point of no tension to point of max tension? -spacing of crossbridges? (myosin heads)-linear -spacing of actin binding sites? –linear -regularly spaced -what happens at the center of myosin filament? -no heads; no cross bridges able to be formed -descending limb from max tension to least tension (from middle to left in pic) -cross bridges swinging in wrong direction -now 0 tension from the shortening side -what length is that, and why? -length of 1 myosin -when myosin is jammed up against the edges of sarcomere -myosin is NOT compressed (even if textbook pic looks like it) -insect asynchronous flight muscle: -each nerve impulse makes muscle contract multiple times -wing beat frequency determined by way that actin/myosin move past each other: myosin able to penetrate through Z bands (via little holes) to super contract -so per 1 AP, there will be mult contractions -resonant frequency: physical prop of any vibrating obj. if given single hit,
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This note was uploaded on 02/19/2010 for the course BIO 361T taught by Professor Bittner during the Spring '08 term at University of Texas.

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110309cap - 11/3/09 -whats the length of no longer tension?...

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