Biology
Biology, 25.02.2020 06:23, chambersjamal05

Physiologically, the degree of skeletal muscle contraction is controlled by: (choose all that apply) Select one or more: a. the number of motor units that are activated. b. the frequency of motor neuron action potentials in each motor unit. c. the amount of tonus. d. positive feedback from the muscle fibers to the motor neuron.

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