To what regulatory protein does calcium bind during the initiation of the contraction cycle in skeletal muscle fibers?
troponin
myosin
tropomyosin
actin
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Which organelle completely surrounds each myofibril inside a muscle fiber?
fascicle
calcium
nucleus
sarcoplasmic reticulum
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The sarcoplasmic reticulum contains __________.
calcium
myofilaments
troponin
T tubules
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T tubules and the terminal cisternae are clustered into structures called __________.
fascicles
myofibrils
sarcomeres
triads
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