7.2 - UNIT 7 Muscles and Muscle Tissue (Chapter 9) Skeletal...

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UNIT 7 Muscles and Muscle Tissue (Chapter 9) Skeletal Muscle Physiology I (7th edition)
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SLIDING FILAMENT THEORY (of skeletal muscle contraction) - An Overview (fig. 9.6) the myosin heads of the thick filaments attach to the actin in the thin filaments, and then pivot to pull thin filaments inward toward the center of the sarcomere; this leads to the H Zones disappearing, the I bands becoming smaller, and the sarcomere becoming shorter; the A band is unchanged during contraction (7th edition)
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SLIDING FILAMENT THEORY (of skeletal muscle contraction) - An Overview (fig. 9.6) the myosin heads of the thick filaments attach to the actin in the thin filaments, and then pivot to pull thin filaments inward toward the center of the sarcomere; this leads to the H Zones disappearing, the I bands becoming smaller, and the sarcomere becoming shorter; the A band is unchanged during contraction this is controlled by a nerve-generated ACTION POTENTIAL ; the impulse travels along the sarcolemma of the muscle cell, down the T tubules, and into the terminal cisternae -- ultimately releasing the stored calcium , and contracting the muscle (7th edition)
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SLIDING FILAMENT THEORY (of skeletal muscle contraction) - The Details the ACTION POTENTIAL on the somatic motor neuron - we will not cover the details of this step until we get to the nervous system; for now just know that: the action potential is conducted along the neuron by traveling along the long, thread-like extension called the AXON , until it reaches the end of the neuron VESICLES containing the neurotransmitter ACETYLCHOLINE (ACh) [Ach is shown as green dots] bind with the plasma membrane at the end of the neuron, and release of ACh (by exocytosis) into the SYNAPTIC CLEFT of the NEUROMUSCULAR JUNCTION (fig 9.7 a,b,c) (7th edition)
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SLIDING FILAMENT THEORY (of skeletal muscle contraction) - The Details the ACTION POTENTIAL on the somatic motor neuron - we will not cover the details of this stepuntil we get to the nervous system; for now just know that: diffusion of ACh across the synaptic cleft to the muscle cell membrane binding of ACh to receptors (shown as 2 large, purple structures on the left) on the muscle cell membrane (7th edition)
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7.2 - UNIT 7 Muscles and Muscle Tissue (Chapter 9) Skeletal...

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