Biology, 19.02.2020 02:52 cheesecake1919

A muscle contracts more strongly when lifting a 20-pound weight than when lifting a 5-pound weight. This is because more fibers are contracting, not because individual fibers contract harder.
a. true
b. false
a. true

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A muscle contracts more strongly when lifting a 20-pound weight than when lifting a 5-pound weight....