The muscle shortens and does work Listen The muscle generates force as it lengthens Question...

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The muscle shortens and does work Listen The muscle generates force as it lengthens Question 12 2 points 1 Concentric contractions 2 Eccentric contractions Select ALL of the following statements that are correct There are two main types of myofibrils one is composed of actin and the other is composed of myosin The sarcoplasmic reticulum surrounds each muscle fiber and stores calcium extracellularly T tubules are extensions of the plasma membrane that protrude deep into the cell interior The carcolemma is the plasma membrane of a skeletal muscle fiber

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