Bio_1A_Lecture_25_Muscle - BIOLOGICAL MOTION Filamentous...

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BIOLOGICAL MOTION Filamentous Proteins and Motors Flagella Cilia Protoplasmic Streaming Actin Myosin Tubulin Keratin etc.
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The cooperation of muscles and skeletons in movement
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Muscles effecting movement without a skeleton
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Sarcomere The structure of skeletal muscle Actin = thin filaments Myosin = thick filaments also called striated muscle multi- nucleate Z line Z line
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actual micrograph schematic representation longitudinal section cross section
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Contraction occurs by sliding (telescoping) of thick and thin filaments
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“Through thick and thin” ACTIN and MYOSIN α -actinin Cross section of sarcomere thick thin THIN FILAMENTS
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Contraction of skeletal muscle Energy stroke for filament sliding provided by ATP
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Cast of Characters
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How does skeletal muscle get activated?
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Some Neuromuscular Junctions (NM Synapses)
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Release of Ca 2+ from the SR is regulated by motor neurons SR = Sarcoplasmic Reticulum (synapse) (sites of Ca 2+ storage)
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The control of muscle contraction: the importance of Ca 2+ Actin
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Bio_1A_Lecture_25_Muscle - BIOLOGICAL MOTION Filamentous...

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