As you lift a heavier weight, what is happening? (select all that apply.) a. you increase the number of muscle fibers activated in each motor unit. b. you increase the number of motor units that are active in each activated muscle. c. you increase the frequency of action potentials in your motor neurons. d. you increase the diameter of muscle fibers activated in a motor unit.
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As you lift a heavier weight, what is happening? (select all that apply.) a. you increase the numbe...
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