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21) Which of the following statements about the microscopic anatomy of skeletal muscle fibers is false?A) Tubular extensions of the sarcolemma penetrate the fiber transversely.
B) Cross striations result from the lateral alignment of thick and thin filaments.C) Each fiber has many nuclei to ensure adequate muscle protein production.D) The net-like sarcoplasmic reticulum surrounds each myofilament.E) All of the answers are true; there are no false answers.
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