Acetylcholine concentrations then increase at neuromuscular junctions to cause involuntary contraction of all muscles.

Tics are rapid, repetitive, involuntary contractions of a group of muscles that can be mild and infrequent or frequent and severe, as in the case of your daughter's cough.

The first stage starts with a series of involuntary contractions of the muscular walls of the uterus and gradual dilation of the cervix.