A muscle twitch is an involuntary small muscle contraction caused by stimulation of the nerve fiber inside the muscle, according to Healthline. Typically, twitches occur in the eyelid or face, explains WebMD, and most tw... More »

www.reference.com Science Human Anatomy Muscles

The cause of twitching chin muscles can be caused by a tumor or blood vessel compressing the nerve, injury to a facial nerve, or a disease such as Bell's palsy, according to the Mayfield Clinic. Anxiety and stress can al... More »

According to ZocDoc, you can stop muscle twitching by taking frequent rest breaks from repetitive forms of work. It may also help if you use ergonomically appropriate work equipment. Other beneficial actions to help stop... More »

www.reference.com Science Human Anatomy Muscles

The twin pectoral muscles, pectoralis major and pectoralis minor, are primarily used to control movement of the arms, explains Healthline. In addition, they assist deep breathing by stretching the rib cage, thus increasi... More »

Tonic smooth muscles show continuous contraction as fluids move around them, while phasic smooth muscles show rhythmic motions that cease after a time, according to class notes from Florida State University College of Me... More »

"Quiet inspiration" is the intake of air into the lungs via the contraction of the diaphragm and external intercostal muscles only, while "quiet expiration" is output of air from the lungs by relaxing these same muscles.... More »

A skeletal muscle twitch is shorter than a tetanic contraction, according to Dr. Paul Deeble of Mary Baldwin College. A twitch contraction is a short, jerky movement in response to a single stimulus in a muscle fiber. A ... More »