9. During muscle contraction, within a sarcomere the ______.
(A) thin filaments get thicker
(B) thick filaments move closer together
(C) Z lines move closer together
(D) thick filaments get thicker
(E) Z lines move closer to the plasma membrane
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The correct answer ...
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這題問的是:當肌肉收縮時,肌節內會發生什...