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During normal contraction of a skeletal muscle fiber
A) The individual Sarcomeres within each myofibril lengthen
B) Energy derived from the hydrolysis of ATP is utilized
C) The myosin myofilaments within individual sarcomeres are pulled inward by the actin myofilaments causing the opposing Z lines to come closer together
D) A and b
E) A, b and c


Sagot :

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