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All of the following are involved in graded contractions of an entire muscle exceptSelect one:a. Contraction of only some muscle fibers within a single motor unit during a finely graded movementb. motor units with a high motor neuron to fiber ratio are used for fine movements, motor units with a low motor neuron to fiber ratio are used for gross movementsc. recruitment of motor unitsd. summation of muscle twitchese. simultaneous spatial and temporal recruitment of motor units and muscle fibres during gross movements

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