Problem: The motor unit in vertebrate skeletal muscle refers to ________. a. one actin binding site and its myosin partner b. one sarcomere and all of its actin and myosin filaments c. one myofibril and all of its sarcomeres d. one motor neuron and all of the muscle fibers on which it has synapses

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The motor unit in vertebrate skeletal muscle refers to ________.

a. one actin binding site and its myosin partner

b. one sarcomere and all of its actin and myosin filaments

c. one myofibril and all of its sarcomeres

d. one motor neuron and all of the muscle fibers on which it has synapses