What is the definition of a "motor unit"? a single muscle fiber plus all of the motor neurons that innervate it all of the muscles that affect the movement of any given joint all of the motor neurons supplying a single muscle a single motor neuron plus all the muscle fibers it innervates a pair of antagonistic muscles

Ihave made a synthetic cell by placing a solution that is 10% sodium chloride inside a semipermeable membrane through which water can pass but not sodium chloride. if i place this cell into a solution that is 20% sodium chloride what will happen to the size of the cell? will it increase, decrease, or stay the same in size?