Which of the following statements is false regarding muscle cells?

B. it is ATP that provides energy for movement of mucle fibres not Acetylcholine.  Acytelcholine is released from the nerve and binds to receptors on the cell surface to initiate the spread of action potential along the muscle cell surface.

in this case Tetanus refers to a normal physiological process. Tetanus can either refer to a disease process that causes paralysis or in the case of normal physiological function it refers to a process whereby multiple action potentials occur in rapid succession so that the muscle remains stimulated and thus remains contracted.  this results in a maximal sustained contraction (called tetanus).  without this process a steady contractile force could not be produced in tissue.