08-MusclesS10b

08-MusclesS10b - 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 Myofibrils comprised mostly of: Actin/myosin interactions Produce contraction Troponin/tropomyosin interactions Control contraction
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Sarcomeres Figure 47.11 Myofibril proteins organized in to structures called:
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Sarcomeres A bands : Dark bands (actin and myosin) H bands : I bands : Light bands (actin) Divided into two halves by a disc of protein called the Z line Z line anchors the actin filaments Sarcomere : area between two Z lines Is the basic subunit of muscle contraction
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Sliding filament model A muscle contracts and shortens because myofibrils contract and shorten Relative to the sarcomere: Distance between Z lines shortens A bands remain essentially unchanged
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08-MusclesS10b - Muscular system Chapter47/lecture 8 Muscle...

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