A muscle fiber shortens when ___ filaments pull on stationary ___ filaments, producing a shortened fiber and a contracted muscle.
a. Myosin; actin
b. Actin; acetylcholine
c. Acetylcholine; myosin
d. Actin; myosin
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Question
A muscle fiber shortens when ___ filaments pull on stationary ___ filaments, producing a shortened fiber and a contracted muscle.
a. Myosin; actin b. Actin; acetylcholine c. Acetylcholine; myosin d. Actin; myosin
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