<unk>  is a medical sign, the involuntary contraction of muscles, caused by diseases and other conditions that increase the action potential frequency. The muscle cramps caused by the disease<unk> s are due to a blocking of the inhibition to the neurons that supply muscles and are not classified as<unk> .<unk>  has two meanings, though both are related to the muscular system.<unk>  (action potential summation)<unk>  (medical sign)
The terms<unk> " and "tetanus" are distinct.<unk>  must be distinguished from the following:
Muscle twitches
Cramps
Carpopedal spasm
Tetany
Stridor
Tet spells
Morphea
Scalp rash
Trench mouth
Nail changes
Rhonchi