08-MusclesS11b - Muscular system Chapter47/lecture 8 Muscle...

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Muscular system Chapter47/lecture 8
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Muscle structure Figure 47.10
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Muscle structure Muscle: Fascicle: Muscle fiber: Elongated cell, multiple nuclei Contains numerous bundled myofibrils Myofibrils comprised of thick and thin myofilaments
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Structure of myofibrils Myofibril proteins organized in to structures called: Actin/myosin interactions produce contraction Interactions control contraction
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Sarcomeres Alternating light and dark bands Light bands (I band) mostly actin Dark bands (A band) mostly myosin
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Sliding filament model Relative to the sarcomere: Distance between Z lines shortens A bands remain essentially unchanged
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Muscle contraction Figure 47.14 But 200,000 sarcomeres end-to-end can result in 8 cm shortening distance
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Muscle contraction: Start with myosin head bound to ATP but not to actin (relaxed muscle)
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This note was uploaded on 02/07/2011 for the course BIO 111 taught by Professor Dr. bos during the Spring '10 term at Purdue University.

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08-MusclesS11b - Muscular system Chapter47/lecture 8 Muscle...

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