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There is no 'multi motor unit' to be different from a single motor unit!
A single motor unit is all the muscle fibers controlled by a single motor neuron.
Multiple motor unit summation is when a smooth and steady increase in muscle tension is produced by increasing the number of active single motor units.
Notice that what's being described is not something having to do with a some non-existent thing called a 'multi motor unit', but rather is a summation of many active singlemotor units.
A single motor unit consists of a single motor neuron and the muscle fibers it innervates, while a multi motor unit consists of multiple motor neurons innervating a group of muscle fibers. Single motor units are important for fine motor control, while multi motor units are involved in generating larger forces.
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