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Muscular System (Cardiac Muscle (Cells are long, cylindrical, branched,…
Muscular System
Cardiac Muscle
Cells are long, cylindrical, branched, has single central nucleus
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Smooth Muscle
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Found mainly in hollow walls of organs, and eyes (controls size of pupil)
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Skeletal Muscle
Cells are long, cylindrical, parallel, and multinucleated
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Function of Muscle
Stabilizing Joints, body posture, and regulating organ volume
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Anatomy of Muscle Fiber
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Sarcolemma
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These contain Glycogen, Myogobulin
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Muscle Activity
Motor Neuron
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Sliding Filament Theory
Nerve Impulse or action potential travels down sarcolemma and into the T-tubules causing saracoplasmic reticulum to release CA++ into sarcoplasm
Myosin attaches to actin, forming actin/myosin crossbridges
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Muscle Contraction
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Ach diffuses across synaptic cleft, and binds with receptors on motor end plate of muscle cell
Electrical Current is generated and is carried along sarcolemma, causes action potential(muscle contraction)
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