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Muscle Contraction
na
6
Biology
11th Grade
05/05/2013
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Term
sarcomere
 Definition
repeating unit of muscle contraction
Term
sarcoplasmic reticulum
 Definition
specialized ER that regulates calcium concentration in cytosol of muscle cells
Term
calcium
 Definition
triggers muscle action
Term
sliding filament model
 Definition
filaments do not change in length when sarcomere shortens
Term
troponin
 Definition
set of additional regulatory proteins, causes shape change, releases tropomyosin, and exposes myosin-binding sites on actin
Term
tropomyosin
 Definition
blocks myosin binding sites on actin
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