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This Concept Map, created with IHMC CmapTools, has information related to: Muscular system - bowen, fotsch, horton, kreeft, monroe, skeletal muscle made of fascicles containing myofibrils, motor neuron has axon terminal which releases ACh, troponin changes shape when Ca2+ binds and unlocks active sites on tropomyosin, myofibrils made of 2 types of myofilaments, skeletal muscle contractions require ATP, Ca2+ binds to troponin, action potential activates voltage-sensitive receptors that trigger release of Ca2+, skeletal muscle has voluntary actions controlled by motor neuron, creatine results from creatine phosphate dephosphorylation ATP, skeletal muscle has many striations, action potential is propagated down into muscle cell by T-tubules, tropomyosin encloses and stiffens actin, myosin head attaches to and detaches from actin, smooth muscle contractions require ATP, smooth muscle lacks striations, ACh associates with muscle cell channels to open, allowing influx of Na+, troponin is a protein located in actin, Ca2+ released from SR, myofilaments thin type is actin, Na+ depolarizes the muscle allowing for firing of action potential