anatomy 4 - 10/06/08 MUSCLE CELL STRUCTURE Function:...

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10/06/08 - MUSCLE CELL STRUCTURE o Function: contraction By product of breakdown of ATP is heat production - NUERO MUSCULAR JUNCTIONS o Communication between neuron and muscle cell o Synaptic knob (fig 10.8) Contains synaptic vesicles Contain neurotransmitters Made of a phospholibid bilayer o “When enough neurotransmitter bonds to enough neurotransmitter receptors, that transfers the impulse from the neuron to the muscle cell” o Most abundant component of cytoplasm area of muscle cell: myofibrials o Carcoplasmic reticulum Extends throughout carcoplasm Terminal cisternum One on each side of t-tubule Storage facilities for calcium ions o Impulse comes down t-tubule since its right next to terminal cisternum, it causes a release of calcium ions stored in the terminal cisternum out into the carcoplasm o In carcoplasm, are myofibrials Calcium ions released from cisternum bind to troponin complexes. Changes the shape of the troponin, this change pulls the tropomyosin off
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This note was uploaded on 03/18/2009 for the course BS 240 taught by Professor Zink during the Spring '09 term at University of the Sciences in Philadelphia.

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anatomy 4 - 10/06/08 MUSCLE CELL STRUCTURE Function:...

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